BUG: Correct CMake message typos: FATAL -> FATAL_ERROR

FATAL will just be emitted as message text, FATAL_ERROR
actually triggers the intended "stop configuring now"
behavior.

Also, messge -> message.

Most of these occurrences are luckily (?) in conditionals
where they are rarely encountered in practice.

Change-Id: I6a10bb6f7539e6c30d9cb1372570c697968226fe
Merge topic 'fix-cmake-message-typos' into master

9e8594e1 BUG: Correct CMake message typos: FATAL -> FATAL_ERROR