doc/Makefile.am - Implement uninstall-local
doc/Makefile.am - Implement uninstall-local

Never change, automake.

Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/652>

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg