Use craftRebuildBlueprint when building

Attempting to fix the build of a specific branch of kdevelop.

Should now invoke:

--target 5.2 kdevelop kdev-php kdev-python

... instead of:

--target 5.2 kdevelop

The latter only used 5.2 branch for kdevelop, and master for kdev-php &
kdev-python. We must use the same branch for every kdevelop project