[test-suite] Disable CLAMR fmemopen() substitute function on FreeBSD / OpenBSD and AIX

FreeBSD (9.2+) / OpenBSD (5.4+) and AIX (6.1+) all have the fmemopen() function nowadays.

Reviewed By: dim, daltenty

Differential Revision: https://reviews.llvm.org/D146374

Author: brad0

MultiSource/Benchmarks/DOE-ProxyApps-C++/CLAMR/fmemopen.c

@@ -15,7 +15,9 @@
 // limitations under the License.
 //
 
-#if !defined(__linux__) && !defined(__NetBSD__) && !(defined(__sun__) && defined(__svr4__))
+#if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
+    !defined(__OpenBSD__) && !(defined(__sun__) && defined(__svr4__)) && \
+    !defined(_AIX)
 
 #include <stdio.h>
 #include <stdlib.h>