Do not lose author name information to locale gotchas.

I noticed format-patch loses authorship information of Lukas' patch
when I run git tools with LC_LANG set to ja_JP.  It turns out that
the sed script to set environment variables were not working on his
name (encoded in UTF-8), which is unfortunate but technically correct.

Force sed invocation under C locale because we always want literal byte
semantics.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-format-patch.sh

@@ -201,7 +201,7 @@ process_one () {
 	    ;;
 	esac
 
-	eval "$(sed -ne "$whosepatchScript" $commsg)"
+	eval "$(LANG=C LC_ALL=C sed -ne "$whosepatchScript" $commsg)"
 	test "$author,$au" = ",$me" || {
 		mailScript="$mailScript"'
 	a\