Using vcruntime is breaking libc++ headers so don't use it.
Differential Revision: https://reviews.llvm.org/D103926
set(LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
set(LIBCXX_ENABLE_STATIC_ABI_LIBRARY OFF CACHE BOOL "")
+ set(LIBCXX_NO_VCRUNTIME ON CACHE BOOL "")
set(BUILTINS_CMAKE_ARGS -DCMAKE_SYSTEM_NAME=Windows CACHE STRING "")
set(RUNTIMES_CMAKE_ARGS -DCMAKE_SYSTEM_NAME=Windows CACHE STRING "")
set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx" CACHE STRING "")