зеркало из https://github.com/mozilla/gecko-dev.git
7b699ef488
This warning dates from bug 910487, which was 7 years ago. Since joining Mozilla I have *always* gotten this warning, and as far as I can tell since I never had a pre-2019 version of Visual Studio on my dev machine, the VS90COMNTOOLS variable was *never* set. Moreover, the "hack" is written in such a way that it does nothing *unless* you have `VS{100,110,120}COMNTOOLS` set, which I never have on my machine either, as you might expect since I only have the one version of Visual Studio installed.
The [latest public build documentation](https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Windows_Prerequisites) recommends that you install the Community edition of Visual Studio 2019, and as of 2019 the variable that's being used is `VS160COMNTOOLS`, so the only way someone would get value out of this hack is if they're using a substantially older version of Visual Studio than we recommend anyway.
Since 1) I *suspect* the hack is not doing anything for the large majority, if not all, of the people currently running builds on Windows on a day-to-day basis and 2) even if the hack continues to do something useful under some hypothetical scenarios, the content of the hack as well as the corresponding warning is so outdated that it should be updated anyway, I propose deleting it entirely.
Differential Revision: https://phabricator.services.mozilla.com/D72925
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