Revert "Disable goma on GCC bots."
Revert "Disable goma on GCC bots."

This reverts commit b9d27d08eee545147cd680099aacd07e3ba7a22e.

Reason for revert: According to https://bugs.chromium.org/p/chromium/issues/detail?id=1021931#c17, this is now fixed.

Original change's description:
> Disable goma on GCC bots.
> 
> This is a temporary workaround to sidestep issues with goma:
> https://ci.chromium.org/p/webrtc/builders/try/linux_compile_gcc_rel/14065
> 
> TBR: phoglund@webrtc.org, artit@webrtc.org
> No-Tree-Checks: true
> No-Try: True
> Bug: chromium:1021931
> Change-Id: I17c5dc46362a72fbe5ec29ba5c921f17870c8576
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159003
> Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
> Reviewed-by: Oleksandr Iakovenko <iakovenko@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29709}

TBR=phoglund@webrtc.org,d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org,artit@webrtc.org,iakovenko@webrtc.org

Bug: chromium:1021931
Change-Id: Ice2848379a617be6c57749d244f115ef61003d5b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159006
Reviewed-by: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29715}

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