CPack: add generators for .7z and .tar.xz (#13072, #14519)
Merge topic 'cpack-add-lzma' into next

87c0959a CPack: add generators for .7z and .tar.xz (#13072, #14519)
ExternalProject: Recognize .tbz2 extension

Also fix .bz2 extension to be .tar.bz2 since we only support compressed
tarballs and not plain compressed files.

Suggested-by: Nils Gladitz <nilsgladitz@gmail.com>
Suggested-by: Rolf Eike Beer <eike@sf-mail.de>
ExternalProject: Recognize lzma-compressed files (#13515)

Add .7z, .tar.xz, and .txz file extensions.

Inspired-by: Joke de Buhr <joke@seiken.de>
Inspired-by: David Cole <DLRdave@aol.com>
Merge topic 'ExternalProject-add-lzma' into next

56e6975c ExternalProject: Recognize lzma-compressed files (#13515)
98ea0344 ExternalProject: Recognize .tbz2 extension