Add format_arg attribute to G_gettext()

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57238 15284696-431f-4ddb-bdfa-cd5b030d7da7

include/defs/glocale.h

@@ -2,6 +2,6 @@
 #define GRASS_GLOCALEDEFS_H
 
 extern void G_init_locale(void);
-extern char *G_gettext(const char *, const char *);
+extern char *G_gettext(const char *, const char *) __attribute__((format_arg (2)));
 
 #endif