t/gitweb-lib: Split HTTP response with non-GNU sed

Recognizing \r in a regex is something GNU sed will do, but other sed
implementation's won't (e.g. BSD sed on OS X).  Instead of two sed
invocations, use a single Perl script to split output into headers
and body.

Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/gitweb-lib.sh

@@ -52,8 +52,18 @@ gitweb_run () {
 	rm -f gitweb.log &&
 	perl -- "$SCRIPT_NAME" \
 		>gitweb.output 2>gitweb.log &&
-	sed -e   '/^\r$/q' <gitweb.output >gitweb.headers &&
-	sed -e '1,/^\r$/d' <gitweb.output >gitweb.body    &&
+	perl -w -e '
+		open O, ">gitweb.headers";
+		while (<>) {
+			print O;
+			last if (/^\r$/ || /^$/);
+		}
+		open O, ">gitweb.body";
+		while (<>) {
+			print O;
+		}
+		close O;
+	' gitweb.output &&
 	if grep '^[[]' gitweb.log >/dev/null 2>&1; then false; else true; fi
 
 	# gitweb.log is left for debugging