Fixes building anbox with clang 4.0 -- removes unused declarations,
makes sure a template is visible at first instantiation, makes sure
exception declarations match between headers and implementations
Signed-off-by: NBernhard Rosenkränzer <bero@lindev.ch>

Make sure helper libraries get built as static libs regardless
of the cmake version being used.

This fixes issue 217.
Signed-off-by: NBernhard Rosenkränzer <bero@lindev.ch>

This gets us rid of one unneeded socket based communication point which
we kept around for historic reasons (from Android QEMU) but don't really
need in our case. This allows a simplication of our setup and improves
performance.

This reverts commit 91d37082.