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[build.py] Add `-fms-compatibility-version=19` to `build.py`

Description

[build.py] Add -fms-compatibility-version=19 to build.py

Summary:
clang-cl can't compile tests containing char16_t and char32_t types
without the MSVC compatibility option passed. This patch adds the option to the
clang-cl call in the build.py script by default.

Reviewers: zturner, labath, stella.stamenova, serge-sans-paille

Reviewed By: labath

Subscribers: lldb-commits, leonid.mashinskiy

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D57809

Details