cmake HAVE__SNPRINTF_ examples

GenericMappingTools/gmt cmake/modules/ConfigureChecks.cmake :190 

check_symbol_exists (vsnprintf stdio.h  HAVE_VSNPRINTF_)

GenericMappingTools/gmt cmake/modules/ConfigureChecks.cmake :207 

check_symbol_exists (_snprintf stdio.h  HAVE__SNPRINTF_)