gallium/aux/cso_cache: Fix various warnings

gallium/aux/cso_cache: Fix various warnings

cso_cache.c: In Function »delete_blend_state«:
cso_cache/cso_cache.c:90:51: Warning: unused parameter »data« [-Wunused-
parameter]
 static void delete_blend_state(void *state, void *data)
                                                   ^~~~
cso_cache/cso_cache.c: In Funktion »delete_depth_stencil_state«:
cso_cache/cso_cache.c:98:59: Warning: unused parameter »data« [-Wunused-
parameter]
 static void delete_depth_stencil_state(void *state, void *data)
                                                           ^~~~
cso_cache/cso_cache.c: In Funktion »delete_sampler_state«:
cso_cache/cso_cache.c:106:53: Warning: unused parameter »data« [-
Wunused-parameter]
 static void delete_sampler_state(void *state, void *data)
                                                     ^~~~
cso_cache/cso_cache.c: In Funktion »delete_rasterizer_state«:
cso_cache/cso_cache.c:114:56: Warning: unused parameter »data« [-
Wunused-parameter]
 static void delete_rasterizer_state(void *state, void *data)
                                                        ^~~~
cso_cache/cso_cache.c: In Funktion »delete_velements«:
cso_cache/cso_cache.c:122:49: Warning: unused parameter »data« [-
Wunused-parameter]
 static void delete_velements(void *state, void *data)
                                                 ^~~~
cso_cache/cso_cache.c: In Funktion »sanitize_cb«:
cso_cache/cso_cache.c:166:52: Warning: unused parameter »user_data« [-
Wunused-parameter]
                                int max_size, void *user_data)
                                                    ^~~~~~~~~
gallium/aux/cso_context.c: a -Wunused-parameter warning

cso_cache/cso_context.c: In Funktion »delete_sampler_state«:
cso_cache/cso_context.c:163:57: Warning: unused parameter »ctx« [-
Wunused-parameter]
 static boolean delete_sampler_state(struct cso_context *ctx, void
*state)
                                                         ^~~

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>