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The main idea was to move complexity from source (and Makefiles)
into configure.ac, because otherwise these must replicate the
"same" branching, often resulting in diversions. Better to keep
the logic in one place (configure.ac) and set additional variables
to be used directly by source code and Makefiles.
Notably this introduce the "using_*" platform flags, which should
be considered constants. There is USING_X11, which actually tells,
if the build uses the platform's X11 (and I opted for the removal
of HAVE_FEATURE_X11). I also consider variables constant, after
they have been exported by AC_SUBST, which should never be
conditional, or some AC_DEFINE set them for a config header.
A large block of defaults depends on $using_x11, so we set them to
the same value, but just if the platform doesn't set it.
The other important flag is $using_freetype_fontconfig, if the
platform uses freetype and fontconfig. The headless plugin uses
cairo for its drawing operations and freetype+fontconfig for text,
so $test_cairo = $using_freetype_fontconfig. This is independent
from a the cairo canvas!
The OpenGL X11 code now depends on USING_X11, but it doesn't yet
reflect the filter in Library_vcl.mk protecting glx. I don't know
how correct this glx filter is, seeing that the source code just
checked for "UNX - some non-X11 targets".
Change-Id: Id1ba1a967a5d8d10ee217458be879ed00459f7e6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116440
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
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