[PATCH] vcl: consolidate common objects in Library_vcl.mk

[Riccardo Magliocchetti]

Store objects from vcl/generic and vcl/headless in a couple of
variables so we don't need to repeat the quite long list for every
target that uses them.

The vcl/headless files currently are used only by the android port but 
the plan is to share them with the headless stuff i'm cooking.

I've done a full build only on top of some local changes because i don't 
have all the needed dependencies on my build machine but it looks it 
works fine :)

thanks

-- 
Riccardo Magliocchetti