package/thrift: disable qt4

package/thrift: disable qt4

host-thrift can fail if a broken Qt4 is found on host:

CMake Error in lib/cpp/CMakeLists.txt:
  Imported target "Qt4::QtCore" includes non-existent path

    "/nvmedata/autobuild/instance-4/output-1/host/usr/mkspecs/default"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

Fixes:
 - http://autobuild.buildroot.org/results/57cad5313896c868e99b0b9534678f1c83a386f2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>