rsnapshot: fix bug in pod that breaks pod2man.

srcpkgs/rsnapshot/template

@@ -1,7 +1,7 @@
 # Template file for 'rsnapshot'
 pkgname=rsnapshot
 version=1.3.1
-revision=1
+revision=2
 build_style=gnu-configure
 hostmakedepends="perl"
 makedepends="perl-Lchown rsync openssh"
@@ -15,6 +15,10 @@ homepage="http://www.rsnapshot.org"
 distfiles="http://www.rsnapshot.org/downloads/${pkgname}-${version}.tar.gz"
 checksum=94b6c77e40628935f42a191bdc28ad93b1f132fde456ee76ee87763f1eddc75e
 
+post_extract() {
+	# Fix pod error.
+	sed -i 's/=head1 USAGE/=back\n\n&/' rsnapshot-program.pl
+}
 post_install() {
 	mv ${DESTDIR}/etc/rsnapshot.conf.default ${DESTDIR}/etc/rsnapshot.conf
 }