[RTL_UNITTEST] Call RtlpInitialize in RtlVirtualUnwind test

This prevents a critical section timeout.

modules/rostests/apitests/rtl/amd64/RtlVirtualUnwind.c

@@ -533,6 +533,7 @@ static VOID Test_SpareCode(VOID)
 
 START_TEST(RtlVirtualUnwind)
 {
+    RtlpInitialize();
     Test_PushNonvol();
     Test_AllocSmall();
     Test_AllocLargeScaled();