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Exit Code Fixes for Windows (#8006)

* return 1 when checks in `flutter.bat` fail
* don't assume file extension of git (depending on the system it can be `git.exe` or `git.bat`)
M
Michael Goderbauer committed
a49c854f671e34396cae13b7ad6d187e49b2979d
Parent: 3c065ad
Committed by GitHub <noreply@github.com> on 2/9/2017, 5:51:11 AM