tar: 64-bit fixes
 [rsc] --rw-rw-r-- M 1812954 glenda sys 24018 Feb 26 21:37 sys/src/cmd/tar.c
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0226/plan9/sys/src/cmd/tar.c /n/sourcesdump/2006/0227/plan9/sys/src/cmd/tar.c]