D16801: Fix build on macOS

[Harald Fernengel]

harald created this revision.
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REVISION SUMMARY
  On macOS, I'm getting the following error:
  
    CMake Error at src/runtime/plugins/CMakeLists.txt:1 (if):
      if given arguments:
    
        "AND" "AND"
    
      Unknown arguments specified
  
  The reason is the double expansion of arguments in CMake, so instead of `if (${FOO})` one should write `if(FOO)`.
  
  This patch fixes the build.

TEST PLAN
  Running `cmake` on Mac OS X passes.

REPOSITORY
  R268 KGlobalAccel

REVISION DETAIL
  https://phabricator.kde.org/D16801

AFFECTED FILES
  src/runtime/plugins/CMakeLists.txt

To: harald
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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