sed -e '/RE/r rfile/' needs space in 'r rfile'

Some implementations of sed (like HP-UX one) mandate a space between 'r'
and 'rfile'.

Signed-off-by: Michal Rokos <michal.rokos@nextsoft.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -552,9 +552,9 @@ git-instaweb: git-instaweb.sh gitweb/gitweb.cgi gitweb/gitweb.css
 	    -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
 	    -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
 	    -e 's/@@NO_PYTHON@@/$(NO_PYTHON)/g' \
-	    -e '/@@GITWEB_CGI@@/rgitweb/gitweb.cgi' \
+	    -e '/@@GITWEB_CGI@@/r gitweb/gitweb.cgi' \
 	    -e '/@@GITWEB_CGI@@/d' \
-	    -e '/@@GITWEB_CSS@@/rgitweb/gitweb.css' \
+	    -e '/@@GITWEB_CSS@@/r gitweb/gitweb.css' \
 	    -e '/@@GITWEB_CSS@@/d' \
 	    $@.sh > $@+
 	chmod +x $@+