Build static lib with static Qt in qbs build also.

Change-Id: Iecb50e81a6a0c34c381e1aeb5299b679feec6ff1
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Fix inheritance of "moduleSearchPaths" from parent project.

This is the only built-in property that should be inherited.

Change-Id: I7af5c95fc7c59f5b5a14e8b17a3925b20ca4aec4
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>