Superfluous entries in PATH variable in generated CMake kits

The CMake kits generated on Linux have an environment entry like the following

    "environmentVariables": {
      "VSCODE_QT_FOLDER": "/home/egon/Qt/6.7.1/gcc_64",
      "PATH": "/home/egon/Qt/6.7.1/gcc_64:/home/egon/Qt/6.7.1/gcc_64/bin:${env:PATH}"
    },

First, the entry /home/egon/Qt/6.7.1/gcc_64 is superfluous on all platforms. There are no binaries nor shared libs in that directory. It shouldn't be necessary to add.

Second, /home/egon/Qt/6.7.1/gcc_64/bin is useful on Windows only to have Qt's DLLs in the search path. We should not need a PATH entry on non-Windows platforms.