Fix that rerunning cmake gives the same result as 1st run

Fix that rerunning cmake gives the same result as 1st run

- SetBuildInformation: strip was missing for 3 of 6 CPU_* variables
  Not sure why this caused only for the first run an extra newline.
  Extra newline doesn't change the build but causes unnessray
  complete rebuild.
- IsFinite: The cached value of whether one of the 3 isfinite
  function was found wasn't set the 2nd time. Thus after reruninng
  cmake the isfinite function wasn't used anymore.

Change-Id: I988763e6b26cc5bae62c4da66cc7b30f2f93c128