remove duplicate file from project file

This fixes the build with qbs 1.3.

Change-Id: Ie4cb9cf96ab25fda0033eb80b00b59d03f89b755
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
QbsProjectManager: Do not reparse the project after every build.

While it is true that additional information about target
artifacts can appear during a build, this data is already
present in the qbs::Project object and can simply be retrieved.
No reparsing is necessary.
The exception is when reparsing was requested while the build
was going on. In that case, we really need to do it after
the build has finished.

Change-Id: Ief3797782ad0ca5651974d4b5d3d64e1199ca9a5
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>