Bzip2 Install Docs

[William Harrington]

LFS installs bzip2 docs with the patch. We may want to include that with our builds.

​http://www.linuxfromscratch.org/patches/lfs/systemd/bzip2-1.0.6-install_docs-1.patch

The install performs the following:

DOCDIR=share/doc/$(DISTNAME)

if ( test ! -d $(PREFIX)/$(DOCDIR) ) ; then mkdir -p $(PREFIX)/$(DOCDIR); fi

cp -f manual.html $(PREFIX)/$(DOCDIR)
cp -f manual.pdf $(PREFIX)/$(DOCDIR)
cp -f manual.ps $(PREFIX)/$(DOCDIR)
cp -f bzip2.txt $(PREFIX)/$(DOCDIR)
chmod a+r $(PREFIX)/$(DOCDIR)/manual.html
chmod a+r $(PREFIX)/$(DOCDIR)/manual.pdf
chmod a+r $(PREFIX)/$(DOCDIR)/manual.ps
chmod a+r $(PREFIX)/$(DOCDIR)/bzip2.txt