[flashrom-gerrit] Change in flashrom[master]: Fix mingw detection on Windows 7 (NT-6.1)

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/23865 )

Change subject: Fix mingw detection on Windows 7 (NT-6.1)
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Patch Set 2: Code-Review+2

I've replaced it with the linked patch and took the liberty to fix
the commit message, too (imperative present tense, max ~60 chars for
the summary).

Miklós, you can amend patches locally and push them again. As long
as you keep the `Change-Id: ...` of the original push in the commit,
Gerrit will add it as another `Patch Set` of the same change.