Portability fix: better checking for MAP_ANONYMOUS and MAP_ANON.

Thanks to Paul Hargrove for identifying the issue and suggesting the
fix.

This commit was SVN r30227.

oshmem/mca/memheap/base/memheap_base_alloc.c

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2013      Mellanox Technologies, Inc.
  *                         All rights reserved.
+ * Copyright (c) 2014 Cisco Systems, Inc.  All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -26,6 +27,13 @@
 #include <infiniband/verbs.h>
 #endif /* MPAGE_ENABLE */
 
+#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
+#    define MAP_ANONYMOUS MAP_ANON
+#endif /* MAP_ANONYMOUS and MAP_ANON */
+#if !defined(MAP_FAILED)
+#    define MAP_FAILED ((char*)-1)
+#endif /* MAP_FAILED */
+
 extern char* mca_memheap_base_param_hca_name;
 
 static int _shm_attach(map_segment_t *, size_t, int, int);
@@ -278,9 +286,7 @@ static int _mmap_attach(map_segment_t *s, size_t size)
                 size,
                 PROT_READ | PROT_WRITE,
                 MAP_SHARED |
-#if defined (__APPLE__)
+#if defined(MAP_ANONYMOUS)
-MAP_ANON |
-#elif defined (__GNUC__)
                 MAP_ANONYMOUS |
 #endif
                 MAP_FIXED,