* lisp/vc-sccs.el (vc-sccs-do-command): New fun. Use the "sccs" command.
(vc-sccs-register, vc-sccs-checkin, vc-sccs-find-revision) (vc-sccs-checkout, vc-sccs-rollback, vc-sccs-revert) (vc-sccs-steal-lock, vc-sccs-modify-change-comment) (vc-sccs-print-log): Use it. * lisp/vc-hooks.el (vc-path): Remove SCCS-specific hack. * lib-src/vcdiff: Use "sccs get" rather than "get"; leave PATH alone.
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