[test/blob] Use MAP_ANON instead of MAP_ANONYMOUS

More portable.
diff --git a/test/test-blob.c b/test/test-blob.c
index beb23a5..f3f7a86 100644
--- a/test/test-blob.c
+++ b/test/test-blob.c
@@ -169,7 +169,7 @@
     {
       uintptr_t pagesize = get_pagesize ();
 
-      data = mmap (NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+      data = mmap (NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
       g_assert (data != (char *) -1);
       memcpy ((char *) data, test_data, sizeof (test_data));
       mprotect ((char *) data, pagesize, PROT_READ);