Use pkg-config to find lcms2 CFLAGS and LIBS (Bug#30346)
* configure.ac: Use EMACS_CHECK_MODULES fors LCMS2 rather than AC_SEARCH_LIBS. * src/Makefile.in: Get LCMS2_LIBS and LCMS2_CFLAGS from configure, instead of just LIBLCMS2. (cherry picked from commit cb386337)
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