MINIFICPP-2523 Fix Chocolatey package name for m4

[fgerlits]

If you run the (python) bootstrap script on Windows, and m4 is not already installed, the script tries to install it using Chocolatey. But it used to fail, because the package is called "gnuwin32-m4", not "m4".

https://issues.apache.org/jira/browse/MINIFICPP-2523

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