cmake HAVE_FSTATVFS examples

MiKTeX/miktex CMakeLists.txt :1305 

check_function_exists(fstatvfs HAVE_FSTATVFS)

MoeMod/CSMoE 3rdparty/fontconfig-cmake/ConfigureChecks.cmake :58 

check_function_exists( fstatvfs HAVE_FSTATVFS )