Please disable the SELinux execstack/relro checks before FC5 final

[Daniel J Walsh]

Anyways I think I will go with allow_execmem allow_execstack for FC5 on 
by default, all confined domains will not have this ability.  For FC6 we 
will turn them off again but add a new unconfined type for 
firefox/thunderbird/evolution and freinds which will
only allow them to use execstack.  When ever you find an library that 
requires these privs please bugzilla them.

Dan