illumos gate

On my Gentoo/illumos port /usr/bin/install is a hardlink to /usr/bin/ginstall. This minor addition allows many sources to build and install which would otherwise need to be patched and saves me a lot of time so I'd rather not remove it, but it does break the illumos build because it's picked up in the path before the version in /opt/onbld. My suggestion is that the path to INS in Makefile.master is made to be absolute.