Converted CMake-language commands to lower case. Ancient CMake versions required upper-case commands. Later command names became case-insensitive. Now the preferred style is lower-case. See https://github.com/Kitware/CMake/commit/77543bd.
Converted our CMake macros to lower case. Ancient CMake versions required upper-case commands. Later command names became case-insensitive. Now the preferred style is lower-case. See https://github.com/Kitware/CMake/commit/77543bd.