i965: Expose ARB_shader_image_load_store.

Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/mesa/drivers/dri/i965/intel_extensions.c

@@ -325,6 +325,7 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_framebuffer_no_attachments = true;
       ctx->Extensions.ARB_gpu_shader5 = true;
       ctx->Extensions.ARB_shader_atomic_counters = true;
+      ctx->Extensions.ARB_shader_image_load_store = true;
       ctx->Extensions.ARB_texture_compression_bptc = true;
       ctx->Extensions.ARB_texture_view = true;