tests/cache_test: allow crossing mount points

When using an overlayfs system (like a Docker container), rmrf_local()
fails because part of the files to be removed are in different mount
points (layouts). And thus cache-test fails.

Letting crossing mount points is not a big problem, specially because
this is just for a test, not to be used in real code.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/compiler/glsl/tests/cache_test.c

@@ -124,7 +124,7 @@ rmrf_local(const char *path)
    if (path == NULL || *path == '\0' || *path != '.')
       return -1;
 
-   return nftw(path, remove_entry, 64, FTW_DEPTH | FTW_PHYS | FTW_MOUNT);
+   return nftw(path, remove_entry, 64, FTW_DEPTH | FTW_PHYS);
 }
 
 static void