fastboot: Remove legacy MINGW workarounds

The version of MINGW we compile with has more advanced POSIX support.
Removing legacy MINGW workarounds as those are not needed anymore.

Change-Id: Id5d67176b719db6c3667be6d63c41432e0ba9f30
Signed-off-by: Rom Lemarchand <romlem@google.com>
3 files changed