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[ms] [llvm-ml] Add support for INCLUDE environment variable

Authored by epastor on Jun 9 2021, 1:05 PM.

Description

[ms] [llvm-ml] Add support for INCLUDE environment variable

Also adds support for the ML.exe command-line flag /X, which ignores the INCLUDE environment variable.

This relands commit c43f413b01b021a8f7b6fce013296114fa92a245 using lit's cross-platform env support.

Differential Revision: https://reviews.llvm.org/D103989