[A] Added xcode to the CI

tests/main_test.c

@@ -61,6 +61,14 @@ int main(void)
 {
     int status = 0;
 
+    /*
+     * Essential for OSX, because swprintf can fail in case of real unicode
+     * chars.
+     */
+#if defined(FT_HAVE_WCHAR)
+    setlocale(LC_CTYPE, "");
+#endif
+
 #ifdef FORT_WB_TESTING_ENABLED
     status |= run_wb_test_suit();
     fprintf(stderr, "\n");