mi: When {en,dis}abling extensions, match names case-insensitively

Both because extension names are inconsistently capitalized on the wire,
and because the table we're walking spells it COMPOSITE not Composite.
The latter is certainly also a bug, but there's no reason for us to be
that strict.

Signed-off-by: Adam Jackson <ajax@redhat.com>

mi/miinitext.c

@@ -190,7 +190,7 @@ EnableDisableExtension(const char *name, Bool enable)
 
     for (i = 0; i < ARRAY_SIZE(staticExtensions); i++) {
         ext = &staticExtensions[i];
-        if (strcmp(name, ext->name) == 0) {
+        if (strcasecmp(name, ext->name) == 0) {
             if (ext->disablePtr != NULL) {
                 *ext->disablePtr = !enable;
                 return TRUE;