MSYS2 : (re)enable ccache in appveyor #6572
Merged
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Fix #6565 - use mingw(32|64) version of ccache instead of msys version.
Revert disabling of ccache in #6566
Remove duplicate use of setting ccache (by setting CXX in ccache.sh) and by using USE_CCACHE and setting PLATFORM_CXX in msys2 makefile. makefile solution (with USE_CCACHE) has been retained.