cmake enable_language(OPTIONAL) examples

CGNS/CGNS CMakeLists.txt :146 

enable_language("Fortran" OPTIONAL)

fmtlib/fmt test/CMakeLists.txt :248 

enable_language(CUDA OPTIONAL)

KhronosGroup/KTX external/fmt/test/CMakeLists.txt :253 

enable_language(CUDA OPTIONAL)

ICLDisco/parsec CMakeLists.txt :100 

enable_language(Fortran OPTIONAL)

ICLDisco/parsec CMakeLists.txt :108 

enable_language(CXX OPTIONAL)