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meson: detect-and-use `-lm` for `fabs` in fcmatch

Sam James requested to merge thesamesam/fontconfig:math-fabs into main

We had a bug report in Gentoo of a sparc64 build failure with -O0:

FAILED: src/libfontconfig.so.1.13.0
sparc64-unknown-linux-gnu-gcc  -o src/libfontconfig.so.1.13.0 src/libfontconfig.so.1.13.0.p/fcatomic.c.o src/libfontconfig.so.1.13.0.p/fccache.c.o src/libfontconfig.so.1.13.0.p/fccfg.c.o src/libfontconfig.so.1.13.0.p/fccharset.c.o src/libfontconfig.so.1.13.0.p/fccompat.c.o src/libfontconfig.so.1.13.0.p/fcdbg.c.o src/libfontconfig.so.1.13.0.p/fcdefault.c.o src/libfontconfig.so.1.13.0.p/fcdir.c.o src/libfontconfig.so.1.13.0.p/fcformat.c.o src/libfontconfig.so.1.13.0.p/fcfreetype.c.o src/libfontconfig.so.1.13.0.p/fcfs.c.o src/libfontconfig.so.1.13.0.p/fcptrlist.c.o src/libfontconfig.so.1.13.0.p/fchash.c.o src/libfontconfig.so.1.13.0.p/fcinit.c.o src/libfontconfig.so.1.13.0.p/fclang.c.o src/libfontconfig.so.1.13.0.p/fclist.c.o src/libfontconfig.so.1.13.0.p/fcmatch.c.o src/libfontconfig.so.1.13.0.p/fcmatrix.c.o src/libfontconfig.so.1.13.0.p/fcname.c.o src/libfontconfig.so.1.13.0.p/fcobjs.c.o src/libfontconfig.so.1.13.0.p/fcpat.c.o src/libfontconfig.so.1.13.0.p/fcrange.c.o src/libfontconfig.so.1.13.0.p/fcserialize.c.o src/libfontconfig.so.1.13.0.p/fcstat.c.o src/libfontconfig.so.1.13.0.p/fcstr.c.o src/libfontconfig.so.1.13.0.p/fcweight.c.o src/libfontconfig.so.1.13.0.p/fcxml.c.o src/libfontconfig.so.1.13.0.p/ftglue.c.o -Wl,--as-needed -Wl,--no-undefined -shared -fPIC -Wl,--start-group -Wl,-soname,libfontconfig.so.1 -m64 -g -O0 -mno-app-regs -mcpu=ultrasparc -mtune=ultrasparc -mno-vis -mno-vis2 -mno-vis3 -mno-vis4 -mno-vis4b -mno-cbcond -mno-fmaf -mno-fsmuld -mno-popc -mno-subxc -fno-builtin -fno-fast-math -Wl,-O1 -Wl,--as-needed -Wl,--no-keep-memory /usr/lib64/libfreetype.so /usr/lib64/libexpat.so -Wl,--end-group -pthread
/usr/lib/gcc/sparc64-unknown-linux-gnu/12/../../../../sparc64-unknown-linux-gnu/bin/ld: src/libfontconfig.so.1.13.0.p/fcmatch.c.o: in function `FcCompareRange':
/var/tmp/portage/media-libs/fontconfig-2.14.2-r3/work/fontconfig-2.14.2-.sparc64/../fontconfig-2.14.2/src/fcmatch.c:220: undefined reference to `fabs'

Ask Meson to detect -lm and add the missing -lm for fabs usage.

Signed-off-by: Sam James sam@gentoo.org

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