cgo: enable cgo on netbsd/386 and netbsd/amd64

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6261056
diff --git a/doc/progs/run b/doc/progs/run
index 92c8da5..48725d3 100755
--- a/doc/progs/run
+++ b/doc/progs/run
@@ -40,6 +40,11 @@
 if [ "$goos" == "freebsd" ]; then
 	c_go_cgo="cgo3 cgo4"
 fi
+# cgo1 and cgo2 don't run on netbsd, srandom has a different signature
+# cgo3 and cgo4 don't run on netbsd, since cgo cannot handle stdout correctly
+if [ "$goos" == "netbsd" ]; then
+	c_go_cgo=""
+fi
 
 timeout="
 	timeout1