[test] [runtime] Do not include alloca.h on NetBSD

On NetBSD, alloca() is in stdlib.h and there is no alloca.h.  Adjust
the includes appopriately.

Differential Revision: https://reviews.llvm.org/D55487

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@348856 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/runtime/test/ompt/misc/interoperability.cpp b/runtime/test/ompt/misc/interoperability.cpp
index 102e6de..b07814e 100644
--- a/runtime/test/ompt/misc/interoperability.cpp
+++ b/runtime/test/ompt/misc/interoperability.cpp
@@ -3,7 +3,11 @@
 
 #include <iostream>
 #include <thread>
+#if !defined(__NetBSD__)
 #include <alloca.h>
+#else
+#include <cstdlib>
+#endif
 
 #include "callback.h"
 #include "omp.h"