udev-180: switch from git checkout to release tarball

* problem is with manpage generation, commit
  http://git.kernel.org/?p=linux/hotplug/udev.git;a=commit;h=6528a3938fe8727b99b210cf504a335d07c94c37
  assumes that even without xstltproc we can install pregenerated
  manpages, but they are only in release tarball (e.g. src/udev.7)
  and without them, build system tries to regenerate and fails:

  /OE/shr-core/tmp-eglibc/sysroots/x86_64-linux/usr/bin/xsltproc -o src/udev.7 -nonet http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl src/udev.xml
  warning: failed to load external entity http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
  cannot parse http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl



Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>