Add editor footer to core files missing it

src/switch_mprintf.c

@@ -922,3 +922,13 @@ SWITCH_DECLARE(char *) switch_snprintfv(char *zBuf, int n, const char *zFormat,
 	return z;
 }
 
+/* For Emacs:
+ * Local Variables:
+ * mode:c
+ * indent-tabs-mode:t
+ * tab-width:4
+ * c-basic-offset:4
+ * End:
+ * For VIM:
+ * vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
+ */