Build clang with LLVM_ENABLE_TERMINFO=OFF.

Removes dynamic lib dependencies from clang, and shouldn't regress
functionality anyone uses.

Bug: none
Change-Id: I4f46af0364a8c6fb90a591c46a50e373e287ae5d
Reviewed-on: https://chromium-review.googlesource.com/1025648Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553196}

tools/clang/scripts/update.py

@@ -521,6 +521,7 @@ def UpdateClang(args):
   base_cmake_args = ['-GNinja',
                      '-DCMAKE_BUILD_TYPE=Release',
                      '-DLLVM_ENABLE_ASSERTIONS=ON',
+                     '-DLLVM_ENABLE_TERMINFO=OFF',
                      # Statically link MSVCRT to avoid DLL dependencies.
                      '-DLLVM_USE_CRT_RELEASE=MT',
                      ]