Add these back, removed with XChat r1516 by the GTK check cleanup

src/common/xchat.h

@@ -586,7 +586,12 @@ struct popup
 /* CL: get a random int in the range [0..n-1]. DON'T use rand() % n, it gives terrible results. */
 #define RAND_INT(n) ((int)(rand() / (RAND_MAX + 1.0) * (n)))
 
+#ifdef WIN32
 #define xchat_filename_from_utf8 g_locale_from_utf8
 #define xchat_filename_to_utf8 g_locale_to_utf8
+#else
+#define xchat_filename_from_utf8 g_filename_from_utf8
+#define xchat_filename_to_utf8 g_filename_to_utf8
+#endif
 
 #endif