git-gui: check whether systems nice command works or disable it
This fixes issue 394 from msysgit. It seems that the Gnuwin32 project provides a nice command but it returns a "not implemented" error. To help users we now try to execute once and disable it in case it fails. Signed-off-by: NHeiko Voigt <hvoigt@hvoigt.net> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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