runtime, net: add support for GOOS=solaris

LGTM=dave, rsc
R=golang-codereviews, minux.ma, mikioh.mikioh, dave, iant, rsc
CC=golang-codereviews
https://golang.org/cl/36030043
diff --git a/src/pkg/net/dial_test.go b/src/pkg/net/dial_test.go
index 15ab10d..9def440 100644
--- a/src/pkg/net/dial_test.go
+++ b/src/pkg/net/dial_test.go
@@ -141,7 +141,7 @@
 		n = 1000
 	}
 	switch runtime.GOOS {
-	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "windows":
+	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "solaris", "windows":
 		// Non-Linux systems take a long time to figure
 		// out that there is nothing listening on localhost.
 		n = 100