git-gui: Make backporting changes from i18n version easier

This is a very trivial hack to define a global mc procedure that
does not actually perform i18n translations on its input strings.
By declaring an mc procedure here in our maint version of git-gui
we can take patches that are intended for the latest development
version of git-gui and easily backport them without needing to
tweak the mc calls first.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -62,6 +62,18 @@ if {![catch {set _verbose $env(GITGUI_VERBOSE)}]} {
 	}
 }
 
+######################################################################
+##
+## Fake internationalization to ease backporting of changes.
+
+proc mc {fmt args} {
+	set cmk [string first @@ $fmt]
+	if {$cmk > 0} {
+		set fmt [string range $fmt 0 [expr {$cmk - 1}]]
+	}
+	return [eval [list format $fmt] $args]
+}
+
 ######################################################################
 ##
 ## read only globals