Revert "Specifying MODULE_AUTHOR sets S and SRC_URI, so we can remove them. It also...

Revert "Specifying MODULE_AUTHOR sets S and SRC_URI, so we can remove them. It also sets HOMEPAGE, but to a suboptimal URI, so it's better to keep it for now"

This reverts commit 94d4cd2d24e105bf0d2c8117e2b5d469ccd13581.

For distributions that fall back into the "gentooisms" category, MODULE_AUTHOR can't be trusted to set SRC_URI properly, since the real source uri can't be guessed from the ebuild name.