Greg Spencer 6db22118ad
Make flutter and dart scripts invoke their batch file equivalents on Windows (#59789)
This makes the flutter and dart scripts invoke their batch file equivalents if running under MINGW (i.e. git-bash) on Windows.

This allows for proper locking, and makes sure that people aren't using two different (and non-mutally-aware) locking systems when running flutter on Windows.

I also fixed a couple of places where we look for MINGW32, which fails under MINGW64. It just looks for MINGW now.
2020-06-18 13:29:24 -07:00
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