if a module provides a function it should also do so if the function

is not functional due to configure findings
the function should offer a meaningful warning if it is not supported
instead of just beeing undefined
i had already changed this in 'gd', now this is doing it for 'standard'

main/php.h

@@ -366,6 +366,12 @@ PHPAPI int cfg_get_string(char *varname, char **result);
 #define XtOffsetOf(s_type,field) XtOffset(s_type*,field)
 #endif
 
+
+#define PHP_NOT_IN_THIS_BUILD { \
+  php_error(E_WARNING, "%s: not supported in this PHP build",get_active_function_name()); \
+  RETURN_FALSE; \
+}
+
 #endif
 
 /*