svn:externals only allows for referencing subversion paths. It does not support referencing git or mercurial repositories.
I don't know anything about curseforge's new packager only supporting https:// in .pkgmeta (if true, that'd be a silly change from them), but more likely your issue is that the paths to all of their repositories changed, so if you are trying to use .pkgmeta check what the project's repository url is now.
Last edited by endx7 : 01-18-17 at 06:12 PM.
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