qtconcurrent/generaterun: compile

Change-Id: I9f3e08d93effaf2f6b6d07136d0867f13c6cd95d
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
qtconcurrent/generaterun: allow to pass the output dir as an argument

The hard-coded paths don't exist anymore.

Change-Id: Ie993f0a08d9dc2d89fa08911c18a09706af2fa24
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>