PaX mprotect now on for amd64

[christos%zoulas.com@localhost (Christos Zoulas)]

Hi,

I just turned on mprotect for amd64. The following sysctls have
been set to 1

    security.pax.mprotect.enable=1
    security.pax.mprotect.global=1

If you want to see what processes hit this you can:

    security.pax.mprotect.debug=1

This breaks programs that need to map segments both writable and executable,
for example java. To fix them you can:

paxctl +m /path/to/bin/java

Enjoy,

christos