ca-certificates: create a /etc/ssl/certs.pem symlink.

This makes python work to verify certs, thanks @dominikh.

srcpkgs/ca-certificates/template

@@ -1,7 +1,7 @@
 # Template file for 'ca-certificates'
 pkgname=ca-certificates
 version=20141019
-revision=2
+revision=3
 noarch="yes"
 hostmakedepends="python"
 depends="virtual?openssl run-parts"
@@ -27,4 +27,5 @@ do_install() {
 	cd ${DESTDIR}/usr/share/ca-certificates
 	find . -name '*.crt' | sort | cut -b3- > ${DESTDIR}/etc/ca-certificates.conf
 	sed -i 's,c_rehash,openssl certhash,g' ${DESTDIR}/usr/sbin/update-ca-certificates
+	ln -s /etc/ssl/certs/ca-certificates.crt ${DESTDIR}/etc/ssl/certs.pem
 }