blorp: Silence unused function warnings

blorp: Silence unused function warnings

vulkan/genX_blorp_exec.c:69:1: warning: ‘blorp_get_surface_base_address’ defined but not used [-Wunused-function]
 blorp_get_surface_base_address(struct blorp_batch *batch)
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from vulkan/genX_blorp_exec.c:35:0:
./blorp/blorp_genX_exec.h:1249:1: warning: ‘blorp_emit_memcpy’ defined but not used [-Wunused-function]
 blorp_emit_memcpy(struct blorp_batch *batch,
 ^~~~~~~~~~~~~~~~~
genX_blorp_exec.c:99:1: warning: ‘blorp_get_surface_base_address’ defined but not used [-Wunused-function]
 blorp_get_surface_base_address(struct blorp_batch *batch)
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from genX_blorp_exec.c:33:0:
../../../../../src/intel/blorp/blorp_genX_exec.h:1249:1: warning: ‘blorp_emit_memcpy’ defined but not used [-Wunused-function]
 blorp_emit_memcpy(struct blorp_batch *batch,
 ^~~~~~~~~~~~~~~~~

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>