[CMake] Run with configuration changes

Description:

After changing CMakefile.txt a dialog is shown that cannot be closed.

Steps to reproduce:

Load CMake project

Switch off option to run CMake automatically  in Preferences -> Kits -> CMake

Add new file or change / rename file / move file to other section  in CMakeLists.txt

**Misbehaviour:**

1. Build is triggered
2. Dialog pops up "Run CMake with configuration changes"

I can either run it with or without changes, but it will run in any case

Expected behavior:

1. Build is not triggered

2. In case it is triggered offer option to abort build.

Workaround:

$ pkill -f qtcreator #  (terminates all QT Creator processes)

Notes:

It is essential for development to be able to build externally because build scripts may define extra environment that needs special handling in QT Creator (or generally such a build script is only run outside QT Creator)