Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp

ggatec/Makefile.depend

@@ -1,3 +1,4 @@
+# $FreeBSD$
 # Autogenerated - do NOT edit!
 
 DIRDEPS = \

ggated/Makefile.depend

@@ -1,3 +1,4 @@
+# $FreeBSD$
 # Autogenerated - do NOT edit!
 
 DIRDEPS = \

ggatel/Makefile.depend

@@ -1,3 +1,4 @@
+# $FreeBSD$
 # Autogenerated - do NOT edit!
 
 DIRDEPS = \