RFC: get rid of virtual/libsdl

[Marcin Juszkiewicz <openembedded@hrw.one.pl>]

I see more and more reports where people has problems with building SDL 
stuff just because they have 'virtual/libsdl == libsdl-qpe' in build 
config. We all know that libsdl-qpe is set of hacks applied to hacks 
which evolved from other hacks and thats that all is in state which no 
one want to have something to do. No one ever sent parts of it upstream, 
no one tried to update it to more recent SDL version etc.

I would like to have one small change in OE: removal of virtual/libsdl at 
all or some kind of other change which would mark libsdl-qpe as not 
providing virtual/libsdl at all. 

Most of SDL stuff in OE builds without problem with libsdl-x11 and most of 
them even works when user with libsdl-qpe tries to use it. But if someone 
tries to build SDL apps with libsdl-qpe then he is hit with linking 
problems, with '-no-rtti/-rtti' problem etc. I'm tired of it.

-- 
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