Compile vppinfra on macOS

Add missing calls to clib_mem_init to vppinfra test codes.

Change-Id: I53ffc6fc287d1a378065bb86c18b6e995ecdb775
Signed-off-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vppinfra/test_format.c b/src/vppinfra/test_format.c
index cc95a00..8370be7 100644
--- a/src/vppinfra/test_format.c
+++ b/src/vppinfra/test_format.c
@@ -180,6 +180,8 @@
 {
   unformat_input_t i;
 
+  clib_mem_init (0, 3ULL << 30);
+
   verbose = (argc > 1);
   unformat_init_command_line (&i, argv);