fix build: new net Makefile

TBR=r
OCL=15996
CL=15996

src/lib/net/Makefile

@@ -3,7 +3,7 @@
 # license that can be found in the LICENSE file.
 
 # DO NOT EDIT.  Automatically generated by gobuild.
-# gobuild -m net net.go fd_darwin.go ip.go cast_amd64.s net_darwin.go
+# gobuild -m net fd_darwin.go net.go net_darwin.go ip.go
 O=6
 GC=$(O)g
 CC=$(O)c -w
@@ -32,7 +32,6 @@ clean:
 
 O1=\
 	ip.$O\
-	cast_$(GOARCH).$O\
 
 O2=\
 	fd_$(GOOS).$O\