Add case-insensitive search for fonts folder

src/filesystem.cpp

@@ -465,7 +465,7 @@ struct FontSetsCBData
 };
 
 static PHYSFS_EnumerateCallbackResult
-findFontsFolderCB (void *data, const char *dir, const char *fname)
+fontSetEnumCB (void *data, const char *dir, const char *fname)
 {
 	FontSetsCBData *d = static_cast<FontSetsCBData*>(data);
 
@@ -503,11 +503,31 @@ findFontsFolderCB (void *data, const char *dir, const char *fname)
 	return PHYSFS_ENUM_OK;
 }
 
+/* Basically just a case-insensitive search
+ * for the folder "Fonts"... */
+static PHYSFS_EnumerateCallbackResult
+findFontsFolderCB(void *data, const char *, const char *fname)
+{
+	size_t i = 0;
+	char buffer[512];
+	const char *s = fname;
+
+	while (s && i < sizeof(buffer))
+		buffer[i++] = tolower(*s++);
+
+	buffer[i] = '\0';
+
+	if (strcmp(buffer, "fonts") == 0)
+		PHYSFS_enumerate(fname, fontSetEnumCB, data);
+
+	return PHYSFS_ENUM_OK;
+}
+
 void FileSystem::initFontSets(SharedFontState &sfs)
 {
 	FontSetsCBData d = { p, &sfs };
 
-	PHYSFS_enumerate("Fonts", findFontsFolderCB, &d);
+	PHYSFS_enumerate("", findFontsFolderCB, &d);
 }
 
 struct OpenReadEnumData