pcre: Disable jit compiler support.

The used jit compiler will be killed by grsecurity and so is not
usable on IPFire systems.
perl-XML-NamespaceSupport: New package.

This is a dependency of docbook2X which is required to generate manpages
for nftables.
perl-XML-SAX-Base: New package.

This is a dependency of docbook2X which is required to generate manpages
for nftables.
perl-XML-SAX: New package.

This is a dependency of docbook2X which is required to generate manpages
for nftables.
docbook2X: New package.

This is a dependency of docbook2X which is required to generate manpages
for nftables.
nftables: Build manpages.

Add docbook2X and docbook-xsl as build dependencies to allow
generation of the manpages.
Merge remote-tracking branch 'stevee/pcre'

Conflicts:
	pcre/pcre.nm
Merge remote-tracking branch 'stevee/docbook2X'