git-gui: use --exclude-standard to check for untracked files

This fixes git-gui failing to display untracked files that are listed
if core.excludefiles is set to ~/.gitexcludes

[PT: added expansion of core.excludesfile value by tcl]

Signed-off-by: Stefan Naewe <stefan.naewe@googlemail.com>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
1 file changed