audio/libresidfp: update to 1.1.2 release, adopt (+)
Release notes: https://github.com/libsidplayfp/libresidfp/releases/tag/v1.1.0 \
https://github.com/libsidplayfp/libresidfp/releases/tag/v1.1.1 \ https://github.com/libsidplayfp/libresidfp/releases/tag/v1.1.2
Approved by: multimedia (jhale via IRC)