use of autoconf and automake. Support NOPORTDOCS. Respect CFLAGS.
Fix libvorbis encoder on Alpha. Install documentation in proper
places.
Approved by: Theo van Klaveren <t.vanklaveren@student.utwente.nl>
(outgoing maintainer), Christian Weisgerber
<naddy@mips.inka.de> (new maintainer)
audio/libao, audio/libogg, audio/libvorbis and audio/vorbis-tools
which need --add-missing to be passed to automake.
PR: 22610
Submitted by: Theo van Klaveren <t.vanklaveren@student.utwente.nl>, roger, sobomax