In the spirit of 12759f67a36d52a345be6002d7017551e8414c59, change
external lib's config.sub to eat the arm-unknown-linux-androideabi
host os string. Also, permit shared libs again - seems Android can
handle those.
Added dictionaries to cross-build-toolset - idxdict is needed.
Should build up to sfx2 - some residual static lib issues there,
and in raptor.
