postgresql: upgrade to 9.4.2

1. remove Backport patches
2. Update the checksume, include CopyRight file, since date in it
is changed
3. remove --without-krb5 configure options, since it become useless
4. Update remove.autoconf.version.check.patch
5. skip to check libperl

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>