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After packaging the complete humble bundle last time I noticed a bit
of code duplication.
Nothing serious, but I still think there could be a small eclass
making things easier.

Especially the "remove_bundled_libs" function and the is useful IMO
and allows to easily remove those things.
The GAMES_PRESERVE_BUNDLED_LIBS array would allow to preserve libs,
e.g. stuff like "libbass" which is not present in the tree and even
GAMES_PRESERVE_BUNDLED_LIBS_amd64 (in case we have a 32bit only game
and there are no multilib versions for some of those libs).

It also works well with a "bundled-libs" useflag (see
games-bin_src_prepare), because it can happen that binary games break
while the tree is moving forward with library versions, or that system
libraries create weird blockers for the user or even cause runtime
breakage (which happened with the editor of games-rpg/grimrock wrt
#454934).

Most bin games use some functions from unpacker.eclass, so it is
inherited and used in games-bin_src_unpack by default.

I was also thinking about some check-reqs thing, but it's probably
better that is handled explicitly.


If you have suggestions or if you think that approach sucks, please
tell me.
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