build dependency on gtk-doc isn't enough to make everything happy, because
the gtk-doc package unhelpfully disables sgml support by default (in the
name of avoiding a "heavy" jade dependency). In order to get a package
that is consistent regardless of which additional packages are installed,
let's just not install the HTML docs at all.
All library names listed by *.la files no longer need to be listed
in the PLIST, e.g., instead of:
lib/libfoo.a
lib/libfoo.la
lib/libfoo.so
lib/libfoo.so.0
lib/libfoo.so.0.1
one simply needs:
lib/libfoo.la
and bsd.pkg.mk will automatically ensure that the additional library
names are listed in the installed package +CONTENTS file.
Also make LIBTOOLIZE_PLIST default to "yes".
