Log Message:
links: update to 2.23.

=== RELEASE 2.23 ===

Tue May 18 20:35:55 CEST 2021 mikulas:

	Fix a bug that the user could set floating-point parameters to nan
	via command-line argument or config file option

Tue May 18 20:22:35 CEST 2021 mikulas:

	Fix broken display if the user uses custom font and non-default
	aspect ratio

Wed May 12 20:08:48 CEST 2021 mikulas:

	Fix a bug that the code incorrectly assumed that mktime returns UTC

Sat May  1 17:56:50 CEST 2021 mikulas:

	Add an option that enables cookie saving