chromium: Link using gold linker flags

I originally wanted to do this a long time (a31301da

) but IIRC back then
it didn't compile. Nowadays with the splitup of the gold linking flags
and the binutils integration, it's merely just a switch to flip, so
let's do that.

Only tested it by building against the current Chromium stable version
on 64bit, because right now builds on Hydra seem to time out (because of
this?) anyway so we have nothing to lose here.

The linking time was hereby reduced from >30 minutes (I didn't measure
it exactly but looked half an hour later to the build progress and it
was *still* linking) to about a few seconds, which I guess is even
though the measurement is quite bogus a tremendous improvement
nonetheless.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>