Apply recent Xorg CVE patches, update dependencies

Added patches for the following upstream CVEs: 2013-7439,
2015-0255, 2015-1802, 2015-1803, 2015-1804.  Also updated the
versions of gnutls, libtasn1, and libjpeg-turbo used to build
static libraries to their latest respective upstream versions.
6 files changed