ninja: Pass -rpath-link when passing -rpath.

Gold works fine without -rpath-link, but GNU ld needs it. The make generator already does this.
To quote the previous make generator CL:
"it appears that ld.bfd is not $ORIGIN-aware and needs additional information to figure out where to find shared libraries that shared libraries depend on"
Review URL: https://codereview.chromium.org/12335018

git-svn-id: http://gyp.googlecode.com/svn/trunk@1580 78cadc50-ecff-11dd-a971-7dbc132099af