go-1.5: fix build on darwin, set to default version for all platforms

pkgs/development/compilers/go/strip.patch

@@ -0,0 +1,12 @@
+diff --git a/src/cmd/go/build.go b/src/cmd/go/build.go
+index 0b14725..a7608ce 100644
+--- a/src/cmd/go/build.go
++++ b/src/cmd/go/build.go
+@@ -2310,6 +2310,7 @@ func (gcToolchain) ld(b *builder, root *action, out string, allactions []*action
+ 		}
+ 	}
+ 	var ldflags []string
++	ldflags = append(ldflags, "-s")
+ 	if buildContext.InstallSuffix != "" {
+ 		ldflags = append(ldflags, "-installsuffix", buildContext.InstallSuffix)
+ 	}