runtime: unify amd64 -buildmode=c-archive/c-shared entry point code

runtime: unify amd64 -buildmode=c-archive/c-shared entry point code

This adds the _lib entry point to various GOOS_amd64.s files.
A future CL will enable c-archive/c-shared mode for those targets.

As far as I can tell, the newosproc0 function in os_darwin.go was
passing the wrong arguments to bsdthread_create. The newosproc0
function is never called in the current testsuite.

Change-Id: Ie7c1c2e326cec87013e0fea84f751091b0ea7f51
Reviewed-on: https://go-review.googlesource.com/69711
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>