disable automagic to find exchange.
disable automagic to find exchange.

This allows build systems to forcefully disable build using exchange
library, even if it was found in the system during compile.



SVN revision: 45917

tasn/enlightenment,tasn/enlightenment,rvandegrift/e,rvandegrift/e,tizenorg/platform.upstream.enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,FlorentRevest/Enlightenment