lablgtk: add dependency on camlp4

Fixes #33703.
Closes #35179.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
lablgtk: add 2.14.2 bottle.
lablgtk: mark camlp4 as a build-time dep
Use "@api private" instead of "@private"

http://www.rubydoc.info/gems/yard/file/docs/Tags.md#private
http://www.rubydoc.info/gems/yard/file/docs/Tags.md#api
The class-level keg_only_reason is private API
libtool 2.4.4

Update to latest stable release, remove obsolete patches, change format
of "make install" command.
libtool: update 2.4.4 bottle.