FreeBSD: disable buggy -fstack-protector-all
FreeBSD: disable buggy -fstack-protector-all

FreeBSD ships an old gcc 4.2.1 which generates
bogus code, e.g. getsockopt() call returns
struct xucred with bogus values, which doesn't even
allow to connect to libvirtd:

error: Failed to find group record for gid '1284660778': No error: 0

So roll back to just -fstack-protector on FreeBSD.

olafhering/libvirt,eskultety/libvirt,eskultety/libvirt,cbosdo/libvirt,datto/libvirt,rlaager/libvirt,cbosdo/libvirt,rlaager/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,olafhering/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,eskultety/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,crobinso/libvirt,libvirt/libvirt,cbosdo/libvirt,elmarco/libvirt,eskultety/libvirt,agx/libvirt,olafhering/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,datto/libvirt,crobinso/libvirt,libvirt/libvirt,libvirt/libvirt,zippy2/libvirt,andreabolognani/libvirt,jfehlig/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,taget/libvirt,andreabolognani/libvirt,rlaager/libvirt,crobinso/libvirt,elmarco/libvirt,cbosdo/libvirt,jfehlig/libvirt,eskultety/libvirt,crobinso/libvirt,nertpinx/libvirt,elmarco/libvirt,nertpinx/libvirt,olafhering/libvirt,agx/libvirt,datto/libvirt,jfehlig/libvirt,zippy2/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,zippy2/libvirt,rlaager/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,agx/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,elmarco/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,taget/libvirt,andreabolognani/libvirt,datto/libvirt,jardasgit/libvirt,datto/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,shugaoye/libvirt,jardasgit/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,libvirt/libvirt,elmarco/libvirt,rlaager/libvirt,cbosdo/libvirt,agx/libvirt