ca-certificates: Try to fetch it from launchpad

The angstrom mirror is very slow in finding the file (no dirhash?),
let's see if canonical is any better in serving the file.

recipes-extra/ca-certificates/ca-certificates_20120623.bb

@@ -4,7 +4,7 @@ SECTION = "misc"
 LICENSE = "GPLv2+"
 LIC_FILES_CHKSUM = "file://debian/copyright;md5=6135800ff6d893c7904d7aad90972eb5"
 
-SRC_URI = "http://sources.angstrom-distribution.org/ca-certificates_${PV}.tar.gz \
+SRC_URI = "https://launchpad.net/ubuntu/+archive/primary/+files/ca-certificates_${PV}.tar.gz \
            file://0001-update-ca-certificates-remove-c-rehash.patch"
 
 SRC_URI[md5sum] = "5105d4cc086f0d4ecf7bf2e4c4667289"