gnucash maint: Fix regex in CMakeLists.txt.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5dcb44d9 (commit)
	from  https://github.com/Gnucash/gnucash/commit/e434835f (commit)



commit 5dcb44d9910481374c2d5e83dec6381fb38e1817
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Nov 30 16:40:35 2018 +0900

    Fix regex in CMakeLists.txt.
    
    Apparently CMake doesn't handle backslashes well and \.
    doesn't work in spite of its being an example in the documentation.



Summary of changes:
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)