Do not do deployment in the install target

The install target of Qt Creator may not deploy any dependencies into the install tree of Qt Creator.

Deployment of dependencies is specific to self-contained binary packages. Doing deployment in the install target prevents e.g. Linux distributions to build and install Qt Creator, and is also not wanted when building & installing yourself on Linux/macOS in general.

It also interferes with the parallel effort of creating CMake based binary packages, since we already have deployment scripts which do exactly what we want. Any initiative to change the way we do deployment should be done separately.

If you want to change deployment from our python script to the CMake build scripts, this must be in a separate component that is excluded from the main install target.