gnucash unstable: Don't copy ChangeLog on a tarball build.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/e9598228 (commit)
	from  https://github.com/Gnucash/gnucash/commit/b92a41b6 (commit)



commit e959822817d690a454551ec880e9da708d080479
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Oct 28 14:21:39 2017 -0700

    Don't copy ChangeLog on a tarball build.
    
    There's no reason to and besides it breaks in-source builds
    because trying to copy onto itself raises an error.



Summary of changes:
 CMakeLists.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)