buildtools-tarball/uninative-tarball/meta-ide-support: Drop useless meta class

The class adds an emtpy PACKAGES setting but most code now uses the
nopackages class which is much clearer. It also adds recursive do_build
dependencies which don't really serve any useful purpose any more.

Simplify the code and drop the class use.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>