Restore building of examples, tests.

Without this, a simple "configure && make" will not build the examples
or tests, even if the "-make tests -make examples" options were used.

This is a partial revert of 709cc880

.

Change-Id: If363cd24d30ba4c102a35ed2617999ae4e9ed9b0
Reviewed-by: Toby Tomkins <toby.tomkins@nokia.com>