This reverts commit da91c9a6.

Reason for revert: Causes undefined behaviour in linker.

Original change's description:
> GLES1: Link against angle_util_static instead of angle_util.
> 
> Attempting to work around missing .so on linux bots.
> 
> BUG=angleproject:2303
> 
> Change-Id: I7fabad308afd420987369b460c13c00781113605
> Reviewed-on: https://chromium-review.googlesource.com/909028
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Commit-Queue: Geoff Lang <geofflang@chromium.org>

TBR=geofflang@chromium.org,lfy@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: angleproject:2303
Change-Id: I8d3f3d9bd618d9604cec0f02424f788cab25b3f9
Reviewed-on: https://chromium-review.googlesource.com/913550Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Lingfeng Yang <lfy@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>