Patch to execve

[Kevin M. Kilbride]

Accidentally replied to sender instead of to list. Apologies again.

Chris Pressey wrote:

SUS is idiotic here.

Would it be possible to apply this but only under #ifndef 
POSIXLY_CORRECT
or something?
 

I agree. Adding a const attribute to system interfaces will _never_ 
break calling code, since it simply advertises a guarantee that the 
code will not change what is supplied. The code either does or it 
doesn't. If it truly doesn't, then why not advertise it as such? It 
can hardly be argued as "breaking" the POSIX interface. There is no 
real hope of making all of userland truly WARNS=6 compliant without it.