enable autolib
handle archives with __.PKGDEF elements (although we can't create them yet)
introduce a pkg directory
search the pkg directory for packages during compilation

SVN=126574
diff --git a/src/cmd/6l/obj.c b/src/cmd/6l/obj.c
index 49fd595..02bd122 100644
--- a/src/cmd/6l/obj.c
+++ b/src/cmd/6l/obj.c
@@ -363,6 +363,7 @@
 		objfile(*argv++);
 
 	if(!debug['l']) {
+		loadlib();
 		a = mal(strlen(goroot)+strlen(goarch)+strlen(goos)+20);
 		sprint(a, "%s/lib/lib_%s_%s.a", goroot, goarch, goos);
 		objfile(a);