• Update `sysutils/unetbootin' to version 661, which had added support for Ubuntu 18.04 and some minor bugfixes
• The project had moved to GitHub from SF, but do not switch to USE_GITHUB just yet (distfile size would be 16257579 bytes in this case, apparently because upstream does not know how to prepare GitHub releases properly)
• Amend the regex when patching main.cpp' for better ${PREFIX} support: previously it was not covering /usr/bin/unetbootin'

Found out via: repology.org