don't mix private and public libraries dependencies.

don't mix private and public libraries dependencies.

when I fixed eina's dependency on -lpthread I used all the libraries
eina links to. But we should just do with -lpthread as it's a public
dependency... that was in eina.pc.in and I missed.

Now we have EFL_ADD_PUBLIC_LIBS() that will register for
requirements_public_libs_name and use internally when eina is used.

This should also fix the problem by Arvind with gcrypt.

SVN revision: 82942