clang build script: Remove a workaround for an issue that's fixed upstream.

Bug: 897796
Change-Id: Iec9b4bf8fbf4626c3bb54be144904b300d438a1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517639Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824074}

tools/clang/scripts/build.py

@@ -542,8 +542,6 @@ def main():
       '-DCLANG_ENABLE_STATIC_ANALYZER=OFF',
       '-DCLANG_ENABLE_ARCMT=OFF',
       '-DBUG_REPORT_URL=' + BUG_REPORT_URL,
-      # See PR41956: Don't link libcxx into libfuzzer.
-      '-DCOMPILER_RT_USE_LIBCXX=NO',
       # Don't run Go bindings tests; PGO makes them confused.
       '-DLLVM_INCLUDE_GO_TESTS=OFF',
       # TODO(crbug.com/1113475): Update binutils.