Linter-related option improvements in the main CMake configuration file

• Explicitly specified the CMP0054 CMake policy in the fc CMake configuration file to suppress configuration warnings
• CMake now tries to find the clang-tidy executable only when the HIVE_LINT option is enabled
• Fixed typo in the main CMake causing the error when configuring with the HIVE_LINT option enabled, clang-tidy installed, and CMake version less than 3.6: (error message):

  CMake Error at CMakeLists.txt:194 (message):
    Unknown CMake command "messgae".