cmake HAVE_FUNCSIG_MACRO examples

TheAssemblyArmada/Thyme cmake/modules/CurrentFunction.cmake :8 

check_symbol_exists(__FUNCSIG__ "" HAVE_FUNCSIG_MACRO)

TheAssemblyArmada/Thyme deps/baseconfig/CMakeLists.txt :164 

check_symbol_exists(__FUNCSIG__ "" HAVE_FUNCSIG_MACRO)