[issue2975] VS8 include dirs grow without bound

[Jim Kleckner]

Jim Kleckner <jek-python at kleckner.net> added the comment:

Actually, now that I think about it a little more, it seems like "very
bad practice" to change the process environment variables as a side effect.

A better solution would be to keep a variable for the required ones that
is modified as necessary.

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