Revert of Build: disable icf for gcc builds with bundled gold (patchset #2 id:20001 of https://codereview.chromium.org/1887303003/ )

Reason for revert:
Seems to be causing a 2.5MiB regression in libchrome.so on Android/ARM. Please re-land with disabling ICF for Linux-only.

See: crbug.com/605494

Original issue's description:
> Build: disable icf for gcc builds with bundled gold
>
> Gold doesn't respect section alignment when merging symbols
> https://sourceware.org/bugzilla/show_bug.cgi?id=17704
>
> BUG=576197
>
> Committed: https://crrev.com/feea41a011671a28dd15e2bb1d1290d817d601c0
> Cr-Commit-Position: refs/heads/master@{#388437}

TBR=dpranke@chromium.org,mcgrathr@chromium.org,ljagielski@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=576197

Review URL: https://codereview.chromium.org/1930473002

Cr-Commit-Position: refs/heads/master@{#390057}
2 files changed