Fix text not displaying on systems without Fontconfig installed.

src/tuxpaint.c

@@ -23635,6 +23635,14 @@ int main(int argc, char *argv[])
   CLOCK_ASM(time2);
 #endif
 
+#if defined(__APPLE__)
+  /* Pango uses Fontconfig which requires /opt/local/etc/fonts/fonts.conf. This
+   * file may not exist on the runtime system, however, so we copy the file
+   * into our app bundle at compile time, and tell Fontconfig here to look for
+   * the file within the app bundle. */
+  putenv((char*) "FONTCONFIG_PATH=Resources/etc");
+#endif
+
 #ifdef FORKED_FONTS
   /* must start ASAP, but depends on locale which in turn needs the config */
 #ifdef NO_SDLPANGO