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tail: seek to EOF to check if seekable. fixes tail on /proc files

--- a/sys/src/cmd/tail.c

+++ b/sys/src/cmd/tail.c

@@ -365,17 +365,8 @@

 	exits("usage");

 }

-/* return true if seeks work and if the file is > 0 length.

- * this will eventually bite me in the ass if seeking a file

- * is not conservative. - presotto

- */

 static int

 isseekable(int fd)

-{	

-	vlong m;

-

-	m = seek(fd, 0, 1);

-	if(m < 0)

-		return 0;

-	return 1;

+{

+	return seek(fd, 0, 2) > 0 && seek(fd, 0, 0) == 0;

 }