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Fixes #267. Hash table lookups assumed qual="any" compare="eq".
Add a test too.

The test-conf build_pattern attempted to convert known constant strings
into integer values. However, it did so by always converting the string
value to an integer if possible and then complaining if the key wasn't
of the expected type. This lead to error messages on "style": "Regular"
since "Regular" was recognized as "weight".

Instead, only attempt conversion from string to integer if the key is
the name of an object which can take an integer type. This eliminates
the spurious non-fatal errors reported when parsing
test-90-synthetic.json.

This also fixes an issue where the created value was given the type of
the object found, but the integer field was assigned. Instead, check
that the object type can take an integer and always set the value type
to integer.

The test-conf test requires libjson-c to be available in order to be
built. However, there has been no user indication that additional tests
could be built if the json-c development files were available.

Continue to not build test-conf if json-c is not available, but do run
the test harness. The test harness is updated to SKIP the test if the
test-conf binary is unavailable.

Reported by AddressSanitizer when running test-conf. The `query`,
`result`, and `result_fs` were not initialized to NULL so could result
in a wild free when first initialized.

The `method` was also not initialized to NULL so comparisons could be
made against random data if it had not yet been assigned.

The outer `fs` was never destroyed, but is also not used, so remove.

Fix leaks reported by AddressSanitizer when running 'make check'.

Posix says:
    The condition can be EXIT, 0 (equivalent to EXIT), or a signal
    specified using a symbolic name, without the SIG prefix, as listed
    in the tables of signal names in the <signal.h> header defined in
    the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 13,
    Headers; for example, HUP, INT, QUIT, TERM. Implementations may
    permit names with the SIG prefix or ignore case in signal names as
    an extension.

Remove 'SIG' from trap conditions in run-test.sh for portability.

'stat ... | grep Modify' fails on non english locales. stat -c '%y'
used in most of the places, but one exception remained.

More clearly delineate which files are associated with each license.

There doesn't appear to be a good reason to abort when 'v1' has type
FcTypeRange. If there does turn out to be a good reason for this then it
should be better documented and the code for handling this case removed.
At worst it seems -1 should be returned as it is for other unknown
types. It is possible this is left over debug code from the initial
implementation.

Found by Clang-Tidy. The intent seems to have been to skip all leading
whitespace in the 'style' string, but instead this loop was an odd
looking no-op. Remove the 'break' from the loop so that it will
continue until end of string or a non-space character is found.

There seems to be a lot of config files using fullname property in the world.
To keep the backward compatibility, fullname property is back to a cache at
the scan matching phase but will be rebuilt once it is done according to family
and style property in the pattern no matter what changes one made in fullname
property during that.

Ref. https://bugzilla.redhat.com/show_bug.cgi?id=1902881

Allow multiple default system font directories in the fallback config, and set them to the default dirs on Darwin.

Fixes fontconfig/fontconfig#233

Instead, when building with Visual Studio-style compilers, define 'FcPublic' as
appropriate so that symbols will be exported without the need to maintain a
.def file.

We were explicitly setting c_args and c_link_args to [], which
overrode the values inherited from the env via CFLAGS and LDFLAGS.

Also add a comment for future reference.

Fixes #263

To work around a warning with GCC10 on Win32

warning: '__builtin___strncpy_chk' specified bound depends on the length of the source argument [-Wstringop-overflow=]

Before this change building with ThreadSanitizer and running
test/test-pthread generated a large number of threading issues. These
mostly stemmed from fc_atomic_ptr_get not doing an atomic load and using
"acquire load" instead of "load acquire". After making these changes it
was still necessary to use fc_atomic_ptr_get where it was needed.

This also documents the current memory barrier requirements for the
atomic primitives.

Until #263
is resolved.

Prevent execution of target's fc-cache on host when installing

When cross compiling gcc/clang could not exist in PATH and Meson could
be using aarch64-linux-android-clang set in a cross file for example.

Some systems build FreeType using CMake rather than autotools (such as Visual
Studio), which will give us CMake config files rather than pkg-config files, so
if we can't find FreeType using pkg-config, try again using CMake.

Please note that according to FreeType's docs/VERSIONS.TXT, the version we want
when checking with CMake is 2.8.1 or later.

Add missing copyright notice.

Fixes #219

to show up easier in COPYING.
it was originally merged from separate file by 2e2121f9 though.

This makes sure that fullname can be constructed at least even if a style is missing
and "Regular" is omitted for fullname so this change won't affect in that case.

Fixes #259