build: fix make tar-headers for Linux

The tar-headers target tries to find and delete links in the
tar folder, which fails as no links are found. Use rm -f to
avoid this.

Remove the config.gypi dependency, as the target runs configure
itself.

PR-URL: https://github.com/nodejs/node/pull/5978


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>