Link error for qversitreader when configure was run without "-tests" option

The test
tests/auto/qversitreader
depends on Qt Mobility symbols only present when configure was run with "-tests" option. Ideally is possible to automatically skip the compilation of tests/auto/qversitreader when -tests option was not used.

Test case 1(example for *nix):

• confirm that the following compilation test passes

  ./configure -modules versit
  make
  cd tests/auto
  qmake
  make
  

Test case 2(example for *nix):

• confirm that the following compilation test passes

  ./configure -modules versit -tests
  make