Bug #7097: do case-insensitive comparison for some hotkeys.

xkb's strcasecmp implementation has been moved to the dix so it's now
safe to just use strcasecmp().

dix/strcasecmp.c

@@ -0,0 +1,50 @@
+/* $Xorg: xkbmisc.c,v 1.4 2000/08/17 19:46:44 cpqbld Exp $ */
+/************************************************************
+ Copyright (c) 1995 by Silicon Graphics Computer Systems, Inc.
+
+ Permission to use, copy, modify, and distribute this
+ software and its documentation for any purpose and without
+ fee is hereby granted, provided that the above copyright
+ notice appear in all copies and that both that copyright
+ notice and this permission notice appear in supporting
+ documentation, and that the name of Silicon Graphics not be
+ used in advertising or publicity pertaining to distribution
+ of the software without specific prior written permission.
+ Silicon Graphics makes no representation about the suitability
+ of this software for any purpose. It is provided "as is"
+ without any express or implied warranty.
+
+ SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
+ GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION  WITH
+ THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ********************************************************/
+/* $XFree86: xc/lib/xkbfile/xkbmisc.c,v 1.7 2003/07/16 02:31:10 dawes Exp $ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <ctype.h>
+#include "dix.h"
+
+#ifdef NEED_STRCASECMP
+int
+xstrcasecmp(char *str1,char *str2)
+{
+    const u_char *us1 = (const u_char *)str1, *us2 = (const u_char *)str2;
+
+    while (tolower(*us1) == tolower(*us2)) {
+        if (*us1++ == '\0')
+            return (0);
+        us2++;
+    }
+
+    return (tolower(*us1) - tolower(*us2));
+}
+#endif