git-gui: use system encoding to show console output

This change makes non-ascii console output (eg server messages in the
`git push` command output) properly render in the git gui windows.

Fixes: prati0100/git-gui#68

Signed-off-by: Yuri Konotopov <[email protected]>

Author: nE0sIghT

lib/console.tcl

@@ -97,7 +97,7 @@ method exec {cmd {after {}}} {
 		lappend cmd 2>@1
 		set fd_f [_open_stdout_stderr $cmd]
 	}
-	fconfigure $fd_f -blocking 0 -translation binary
+	fconfigure $fd_f -blocking 0 -translation binary -encoding [encoding system]
 	fileevent $fd_f readable [cb _read $fd_f $after]
 }