rpcrt4/tests: Cast-qual warnings fix.

dlls/rpcrt4/tests/cstub.c

@@ -605,7 +605,7 @@ static void test_CreateStub(IPSFactoryBuffer *ppsf)
     IUnknown *obj = (IUnknown*)&vtbl;
     IRpcStubBuffer *pstub = create_stub(ppsf, &IID_if1, obj, S_OK);
     CStdStubBuffer *cstd_stub = (CStdStubBuffer*)pstub;
-    CInterfaceStubHeader *header = ((CInterfaceStubHeader *)cstd_stub->lpVtbl) - 1;
+    const CInterfaceStubHeader *header = ((const CInterfaceStubHeader *)cstd_stub->lpVtbl) - 1;
 
     ok(IsEqualIID(header->piid, &IID_if1), "header iid differs\n");
     ok(cstd_stub->RefCount == 1, "ref count %d\n", cstd_stub->RefCount);

dlls/rpcrt4/tests/ndr_marshall.c

@@ -224,7 +224,7 @@ todo_wine {
 
 static int deref_cmp(const void *s1, const void *s2, size_t num)
 {
-    return memcmp(*(void**)s1, *(void**)s2, num);
+    return memcmp(*(const void *const *)s1, *(const void *const *)s2, num);
 }