Drop Python 2 support, fix forward-compatibility
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CI: Disable documentation build with Python 3.10
The version of sphinx in Ubuntu impish is not currently fully compatible with Python 3.10.
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build: Use sysconfig in preference to distutils.util
distutils is deprecated and likely to be removed in Python 3.12.
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Remove support for Python 2
Python 2 reached EOL on 2020-01-01, and the latest version of AX_PYTHON_DEVEL breaks the build with Python 2. This seems as good a time as any to drop compatibility.
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m4: Update AX_PYTHON_DEVEL for better forward-compatibility
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build: Make sure distcheck installs into our ${prefix}
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build: Use LT_INIT instead of deprecated AC_PROG_LIBTOOL
This has been available since at least libtool 1.9b (2004).
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build: Update bug reporting URL
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.gitignore: Ignore build-system backup files
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build: Use AS_HELP_STRING instead of deprecated AC_HELP_STRING
This has been available since at least autoconf 2.59c (2006).