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Minor header cleanups & attribute additions

Alan Coopersmith requested to merge alanc/libxcb:misc into master

xcb.h: remove __solaris__ ifdef

Nothing was defining __solaris__ on Solaris in current build setup, and
it's not needed on Solaris 10 (released 2005) and later, which has
stdint.h.  (Solaris 2.6 - 9 had inttypes.h, but no stdint.h.)

xcb.h: use __has_attribute to check for attribute((__packed__)) support

Allows supporting it in compilers that don't define `__GNUC__`

add pure & const function attributes suggested by gcc -Wsuggest-attribute

This only covers the ones in the pre-written code.  There are many more
suggested in the generated code, which will require changing the generator
and will thus be handled separately.

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