This allows running a cross-compile like
	GOOS=darwin GOARCH=arm go build std
to check that everything builds.

Otherwise there is a redefinition error because both
root_nocgo_darwin.go and root_darwin_armx.go
supply initSystemRoots.

Change-Id: Ic95976b2b698d28c629bfc93d8dac0048b023578
Reviewed-on: https://go-review.googlesource.com/12897Reviewed-by: Ian Lance Taylor <iant@golang.org>