Add upstreamed patch for Okular
* Makefile.am (EXTRA_DIST): Update list of patches. * patches-appimage/okular/0001-Disable-comicbook-generator.patch: Remove. * patches-appimage/okular/0001-Make-KF5Pty-dependency-optional.patch: New. * src/appimage/Makefile.am (appimage_pkg_okular_configure): Add KF5Pty to FORCE_NOT_REQUIRED_DEPENDENCIES.
This replaces the simple "comment comicbook out" patch with the patch
that is being upstreamed and which makes KF5Pty an optional dependency.