cmake: avoid double variable expand

CMakeLists.txt

@@ -340,8 +340,8 @@ OCV_OPTION(CV_ENABLE_INTRINSICS       "Use intrinsic-based optimized code" ON )
 OCV_OPTION(CV_DISABLE_OPTIMIZATION    "Disable explicit optimized code (dispatched code/intrinsics/loop unrolling/etc)" OFF )
 OCV_OPTION(CV_TRACE                   "Enable OpenCV code trace" ON)
 
-OCV_OPTION(ENABLE_PYLINT              "Add target with Pylint checks"                            (${BUILD_DOCS} OR ${BUILD_EXAMPLES}) IF (NOT CMAKE_CROSSCOMPILING AND NOT APPLE_FRAMEWORK) )
-OCV_OPTION(ENABLE_FLAKE8              "Add target with Python flake8 checker"                    (${BUILD_DOCS} OR ${BUILD_EXAMPLES}) IF (NOT CMAKE_CROSSCOMPILING AND NOT APPLE_FRAMEWORK) )
+OCV_OPTION(ENABLE_PYLINT              "Add target with Pylint checks"                            (BUILD_DOCS OR BUILD_EXAMPLES) IF (NOT CMAKE_CROSSCOMPILING AND NOT APPLE_FRAMEWORK) )
+OCV_OPTION(ENABLE_FLAKE8              "Add target with Python flake8 checker"                    (BUILD_DOCS OR BUILD_EXAMPLES) IF (NOT CMAKE_CROSSCOMPILING AND NOT APPLE_FRAMEWORK) )
 
 if(ENABLE_IMPL_COLLECTION)
   add_definitions(-DCV_COLLECT_IMPL_DATA)