Revert "[build] Suppress -Wenum-constexpr-conversion"

This reverts commit b3070c52557323463e6b9827e2343e60e1b91f85 .

Reason for revert: The warning is not firing anymore because of changes in LLVM.

Original change's description:
> [build] Suppress -Wenum-constexpr-conversion
>
> Clang recently added a warning for values outside enum range in
> https://reviews.llvm.org/D131307 and https://reviews.llvm.org/D130058.
> This triggered a warning in icu, which is reported in
> https://unicode-org.atlassian.net/browse/ICU-22113
>
> This patch temporarily suppresses -Wunknown-warning-option and
> -Wenum-constexpr-conversion in Fucshia to fix the builders.
>
> Change-Id: I5c89e3a22cf52145232bfcd001ac3495daafa287
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3821449
> Reviewed-by: Jungshik Shin <jshin@chromium.org>

Change-Id: I454dbdb0d82bb28db6513fe60cbcdc9cb7d81b11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3901073
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
1 file changed