gnucash unstable: Remove reference to GTEST_DISABLE, it no longer exists

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/e2535abb (commit)
	from  https://github.com/Gnucash/gnucash/commit/4a97269e (commit)



commit e2535abb954334bda7292699110acf4111abc988
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Sat Apr 14 08:17:34 2018 +0200

    Remove reference to GTEST_DISABLE, it no longer exists
    
    The google test framework is a required dependency.



Summary of changes:
 cmake/README_CMAKE.txt | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)