lcms2: Update to 2.15

Changelog:
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2.15 Maintenance release
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New MESON build system, many thanks to amispark and Lovell Fuller for bringing this.
Fixed a bug that caused memory corruption on colord
cmsReadRawTag can read portions  of tags again. Removing this caused colord to segfault when dumping profiles
Added more checks based of fuzzer discoveries.
MSYS2 can now compile lcms2
Checked on Apple Silicon M1 and M2
Fixed a bug of fastfloat plug-in that affected Krita CMYK color selector

(ryoon)