64-bit machines use _seek as the syscall, so set the bp there.
this prevents inserting a bogus bp in seek() which is in libc.

Reference: /n/atom/patch/applied/truss64seek
Date: Fri Feb 14 05:17:05 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/lib/acid/truss	Fri Feb 14 05:16:39 2014
+++ /sys/lib/acid/truss	Fri Feb 14 05:16:40 2014
@@ -167,6 +167,8 @@
 	{
 		name = head lst;
 		lst = tail lst;
+		if regexp("seek", name) && (objtype=="amd64" || objtype == "power64" || objtype == "alpha") then
+			name = "_seek";
 		addr = addressof(name);
 		if addr then
 		{