Remove unneeded liblxqt dependencies

Actually liblxqt-mount is totally independent from liblxqt. liblxqt is used
only to get LXQT_VERSION LXQT_MAJOR_VERSION.
We need a better way to do this and drop totally liblxqt dependency.

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
Removes the last dependency on liblxqt

liblxqt as being used to set the version only.
Dropping it. The version is now set in the CMakelist.txt file.

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
Fixes an typo in an CMakeList.txt variable

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
Merge branch 'remove-some-lxqt-dependencies'

* remove-some-lxqt-dependencies:
  Fixes an typo in an CMakeList.txt variable
  Removes the last dependency on liblxqt
  Remove unneeded liblxqt dependencies