Fix build with gcc3.1 (-CURRENT).
PR: 40830
Submitted by: Jan Stocker <Jan.Stocker@t-online.de>
Minor cleanup while we're here.
Approved by: maintainer
Make id3lib use libtool correctly. Use automake/autoconf along with a patch
to configure.in instead of configure. Sort plist. Remove redundate
GNU_CONFIGURE. Use LOCALBASE in CONFIGURE_ENV rather than PREFIX.