Perform case insensitive comparisons for matching voice names.

src/include/compat/strings.h

+/* Compatibility shim for <strings.h>
+ *
+ * Copyright (C) 2016 Reece H. Dunn
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see: <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef STRINGS_H_COMPAT_SHIM
+#define STRINGS_H_COMPAT_SHIM
+
+#ifdef _MSC_VER
+
+#include <string.h>
+
+#define strcasecmp stricmp
+
+#endif
+
+#endif

src/libespeak-ng/voices.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <wctype.h>
 
 #if defined(_WIN32) || defined(_WIN64)
 	last_part_len = strlen(last_part);
 
 	for (ix = 0; voices[ix] != NULL; ix++) {
-		if (strcmp(name, voices[ix]->name) == 0) {
+		if (strcasecmp(name, voices[ix]->name) == 0) {
 			match_name = ix; // found matching voice name
 			break;
 		} else {
 			id = voices[ix]->identifier;
-			if (strcmp(name, id) == 0)
+			if (strcasecmp(name, id) == 0)
 				match_fname = ix; // matching identifier, use this if no matching name
-			else if (strcmp(last_part, &id[strlen(id)-last_part_len]) == 0)
+			else if (strcasecmp(last_part, &id[strlen(id)-last_part_len]) == 0)
 				match_fname2 = ix;
 		}
 	}