Mk/Uses/tar.mk: revert "Add .tar.zst support (USES=tar:zst or USES=tar:zstd)"
This reverts commit 863e0d46e6fac215477cf3f9787fb89bd216191c.
Reverted due to error:
===> libmtdev-1.1.6_1 Incorrect 'USES+=tar:bz2'.
- Error code 1
Stop.
Please fix, test, and readd.
With hat: portmgr