xi: More warning cleanup for input

Lots more const char stuff.

Remove duplicate defs of CoreKeyboardProc and CorePointerProc from
test/xi2/protocol-common.c

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

test/input.c

@@ -1101,7 +1101,7 @@ xi_unregister_handlers(void)
 static void
 cmp_attr_fields(InputAttributes * attr1, InputAttributes * attr2)
 {
-    char **tags1, **tags2;
+    const char **tags1, **tags2;
 
     assert(attr1 && attr2);
     assert(attr1 != attr2);
@@ -1182,7 +1182,7 @@ dix_input_attributes(void)
 {
     InputAttributes orig = { 0 };
     InputAttributes *new;
-    char *tags[4] = { "tag1", "tag2", "tag2", NULL };
+    const char *tags[4] = { "tag1", "tag2", "tag2", NULL };
 
     new = DuplicateInputAttributes(NULL);
     assert(!new);

test/xi2/protocol-common.c

@@ -43,9 +43,6 @@ static ClientRec server_client;
 
 void *userdata;
 
-extern int CorePointerProc(DeviceIntPtr pDev, int what);
-extern int CoreKeyboardProc(DeviceIntPtr pDev, int what);
-
 static void
 fake_init_sprite(DeviceIntPtr dev)
 {