Find choco msys mingw

4c835c4 introduced an effort to find mingw if installed as part
of the msys2 chocolatey package. Unfortunately that change worked
only for one specific user (me) who had set environment variable
%ChocolateyToolsLocation% to a prefix in that path. Instead, reference
the environment variable to try to find it. Usually we don't like
environment variables, but this one actually makes the lookup *less*
system-specific, as it extracts the best possible guess where chocolatey
has put the files on that system.

Also moved a CHANGES.txt entry that had gotten merged under an earlier
release (submission of that PR had been before 4.5 went out)

Signed-off-by: Mats Wichmann <mats@linux.com>

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