Move nsswitch.h into libc/dns/include.

Not a public header file except in NetBSD, where it came from. Even
OpenBSD doesn't have it.

Bug: http://b/28519060
Change-Id: Id5feec4a4e8010a9f4433e73b1bfa6f935d884b9
This commit is contained in:
Elliott Hughes 2016-05-02 12:24:58 -07:00
parent ec4671928c
commit 42d752754e