cmake COMPILER_HAS_DEPRECATED_MSG examples

AMICI-dev/AMICI ThirdParty/sundials/cmake/SundialsSetupCompilers.cmake :253 

check_c_source_compiles("
  #define msg \"test\"
  ${COMPILER_DEPRECATED_MSG_ATTRIBUTE} int somefunc(void) { return 0; }
  int main(void) { return somefunc();}" COMPILER_HAS_DEPRECATED_MSG
)