intel: move stubs to the respective source files
diff --git a/icd/intel/gpu.c b/icd/intel/gpu.c
index eb04e1a..bc85c85 100644
--- a/icd/intel/gpu.c
+++ b/icd/intel/gpu.c
@@ -382,3 +382,11 @@
     return (intel_gpu_has_extension(gpu, (const char *) pExtName)) ?
         XGL_SUCCESS : XGL_ERROR_INVALID_EXTENSION;
 }
+
+XGL_RESULT XGLAPI intelGetMultiGpuCompatibility(
+    XGL_PHYSICAL_GPU                            gpu0,
+    XGL_PHYSICAL_GPU                            gpu1,
+    XGL_GPU_COMPATIBILITY_INFO*                 pInfo)
+{
+    return XGL_ERROR_UNAVAILABLE;
+}