Merge branch 'git-gui--askpass-utf-8'

This fixes the problem where Git was not receiving non-ASCII characters
correctly in `git-gui--askpass`'s answer.

This used to be #2542, but
due to this maintainer's mistake, that PR was closed instead of updated
;-)

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

git-gui/git-gui--askpass

@@ -56,6 +56,11 @@ proc finish {} {
 		}
 	}
 
+	# On Windows, force the encoding to UTF-8: it is what `git.exe` expects
+		if {$::tcl_platform(platform) eq {windows}} {
+		set ::answer [encoding convertto utf-8 $::answer]
+	}
+
 	puts $::answer
 	set ::rc 0
 }