Makefile: Add bin/test-driver to EXTRA_FILES

Makefile: Add bin/test-driver to EXTRA_FILES

I'm not sure why this change is necessary. When I've built previous tar files
(such as 9.2.4) with the "make tarballs" target, they include the
bin/test-driver file. But at my first attempt to build the tar files for the
10.0.1 release this file was not being included and the build failed.

(cherry picked from commit d573899b932435b0b37a7a33ebcbdc3c8cedd3e1)

[The cherry pick is because I original applied this on the 10.0 branch while
working on the 10.0.1 release. But if we don't have this on master as well,
this issue will trip us up again the next time we make a new major-release
branch off of master.]