Turn on MALLOC_PRODUCTION

Approved by:	re (implicit)
Noticed by:	kevans
Sponsored by:	Rubicon Communications, LLC ("Netgate")

share/mk/src.opts.mk

@@ -146,6 +146,7 @@ __DEFAULT_YES_OPTIONS = \
     MAIL \
     MAILWRAPPER \
     MAKE \
+    MALLOC_PRODUCTION \
     MLX5TOOL \
     NDIS \
     NETCAT \
@@ -211,7 +212,6 @@ __DEFAULT_NO_OPTIONS = \
     LOADER_FIREWIRE \
     LOADER_VERBOSE \
     LOADER_VERIEXEC_PASS_MANIFEST \
-    MALLOC_PRODUCTION \
     OFED_EXTRA \
     OPENLDAP \
     RPCBIND_WARMSTART_SUPPORT \