[reSIProcate] forward decl class resip::SipStack

[Kennard White <kennard_white@xxxxxxxxxxxx>]

Hi,

In a few places in the resip code base I've found forward declations like "class resip::SipStack" in header files. My compiler complains that these are useless. I think the correct syntax is "namespace resip { class SipStack; };". Can anyone confirm this? If so, I'll fix these as I find them.

Thanks,
Kennard