This addresses LLDB bug 31699, which was caused by LLVM using static linking on Windows.

In order to make sure that LLVM continues to work on machines that do not have the Universal CRT yet,
we'll need to ship a copy of UCRT in the Windows installation package. Fortunately, CMake 3.6+ already
supports app-local deployment of UCRT dlls, we just need to turn this on.

Differential Revision: https://reviews.llvm.org/D29146

llvm-svn: 293373