Static binaries which do not call execve() were not calling

Static binaries which do not call execve() were not calling
pinsyscall(SYS_execve, ...).  Upon review, this is a fairly small
set of programs which either pledge() aggressively or don't usually
operate in a risky operating environment.  We now point at a location
which is definately not a "syscall" instruction.
ok kettenis