build: Use AX_IS_RELEASE
Check for the presence of a git repository to determine whether things like compiler warnings should be fatal. The warnings themselves will be hooked up later. This adds an implicit dependency on autoconf-archive or GNOME’s m4-common. These are pulled in by JHBuild, and the relevant macros are automatically distributed in tarballs — so the dependencies only need to be explicitly installed if you are building from git without using JHBuild. This is an unsupported use case. Note that AC_CONFIG_MACRO_DIR() has already been added to configure.ac. https://wiki.gnome.org/Projects/GnomeCommon/Migration
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3c04bf88
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