gnucash maint: Add config and cache files for clangd.

[Mike Alexander]

Updated	 via  https://github.com/Gnucash/gnucash/commit/85be581e (commit)
	from  https://github.com/Gnucash/gnucash/commit/3c0dfb27 (commit)



commit 85be581e97f23974fd6ff619d0e37496ad05e768
Author: Mike Alexander <mta at umich.edu>
Date:   Wed Jan 26 01:01:25 2022 -0500

    Add config and cache files for clangd.



Summary of changes:
 .gitignore | 2 ++
 1 file changed, 2 insertions(+)