Fix WiX test and turn it into an autotest.

Change-Id: Ifd1cdfc54e7566146a478cf0833a6f67196735cd
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Fix linking of MSIs built from multiple WiX source files.

Task-number: QBS-541
Change-Id: I177c755ee203df1018039683da860b26dd9ec820
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
WiX: Fix the "cultures" property handling

Task-number: QBS-542
Change-Id: I4ec5bf6020732155ab1a20583861e4bbadd196d9
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>