D14187: Fix variable definition check

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  We'd check if the variable's value is defined, which is wrong and prevented us
  from properly initialising using these deprecated variables.
  It would also ignore the value we're passing to the actually right variable when
  using it.

TEST PLAN
  Built kstars which needs -DCMAKE_ANDROID_API=24

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D14187

AFFECTED FILES
  toolchain/Android.cmake

To: apol, #frameworks
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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