Remove redundant definition addition for BUILD_FILE_PROVIDER_MODULE

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

CMakeLists.txt

@@ -190,7 +190,6 @@ endif()
 if (APPLE)
     # build macOS File Provider module
     option(BUILD_FILE_PROVIDER_MODULE "BUILD_FILE_PROVIDER_MODULE" ON)
-    add_definitions(-DBUILD_FILE_PROVIDER_MODULE=${BUILD_FILE_PROVIDER_MODULE})
 endif()
 
 # When this option is enabled, 5xx errors are not added to the blacklist