git-gui: handle the encoding of Git's output correctly

If we use 'eval exec $opt $cmdp $args' to execute git command,
tcl engine will convert the output of the git comand with the rule
system default code page to unicode.

But cp936 -> unicode conversion implicitly done by exec is not reversible.
So we have to use git_read instead.

Bug report and an original reproducer by Cloud Chou:
msysgit#302

Cloud Chou find the reason of the bug.

Thanks-to: Johannes Schindelin <johannes.schindelin@gmx.de>
Thanks-to: Pat Thoyts <patthoyts@users.sourceforge.net>
Reported-by: Cloud Chou <515312382@qq.com>
Original-test-by: Cloud Chou <515312382@qq.com>
Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Cloud Chou <515312382@qq.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

Author: kblees

git-gui.sh

@@ -534,31 +534,10 @@ proc _lappend_nice {cmd_var} {
 }
 
 proc git {args} {
-	set opt [list]
-
-	while {1} {
-		switch -- [lindex $args 0] {
-		--nice {
-			_lappend_nice opt
-		}
-
-		default {
-			break
-		}
-
-		}
-
-		set args [lrange $args 1 end]
-	}
-
-	set cmdp [_git_cmd [lindex $args 0]]
-	set args [lrange $args 1 end]
-
-	_trace_exec [concat $opt $cmdp $args]
-	set result [eval exec $opt $cmdp $args]
-	if {[encoding system] != "utf-8"} {
-		set result [encoding convertfrom utf-8 [encoding convertto $result]]
-	}
+	set fd [eval [list git_read] $args]
+	fconfigure $fd -translation binary -encoding utf-8
+	set result [string trimright [read $fd] "\n"]
+	close $fd
 	if {$::_trace} {
 		puts stderr "< $result"
 	}