message: Change default cmake build type to Release
diff: -# Set a default build type if none was specified
  set(DEFAULT_CMAKE_BUILD_TYPE Release)
  -if(EXISTS ${CMAKE_SOURCE_DIR}/.git)
  - set(DEFAULT_CMAKE_BUILD_TYPE Debug)
  -endif()
  # CMAKE_BUILD_TYPE is not available if a multi-configuration generator is used
  # (eg Visual Studio generators)
  