gnucash-docs maint: Install license files COPYING and COPYING-DOCS

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/7c0642f0 (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/ee9fa864 (commit)



commit 7c0642f0748ba06f73baaaf396c369e08cc392b9
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Tue Sep 21 16:28:25 2021 +0200

    Install license files COPYING and COPYING-DOCS



Summary of changes:
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)