configure.ac, app: require liblcms2 >= 2.7
and add an lcms2 runtime version check to app/sanity.c Fixes: Bug 736701 - LCMS2 rounding errors cause problems with certain GIMP blend modes
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572d5566
and add an lcms2 runtime version check to app/sanity.c Fixes: Bug 736701 - LCMS2 rounding errors cause problems with certain GIMP blend modes