Fix for STORM-1854. Adapted the fix based on other open source consumers of fontconfig that were encountering the same error.

indra/llwindow/llwindowsdl.cpp

@@ -2646,8 +2646,9 @@ std::vector<std::string> LLWindowSDL::getDynamicFallbackFontList()
 	if (sortpat)
 	{
 		// Sort the list of system fonts from most-to-least-desirable.
+		FcResult result;
 		fs = FcFontSort(NULL, sortpat, elide_unicode_coverage,
-				NULL, NULL);
+				NULL, result);
 		FcPatternDestroy(sortpat);
 	}