Always enable PIE
    
    PIE is currently enabled for qemu-kvm builds, and disabled for
    qemu-user-static builds.
    
    --disable-pie is causing https://bugzilla.redhat.com/show_bug.cgi?id=2256916
    
    This commit ensures --enable-pie is used for both qemu-kvm and
    qemu-user-static.
    
    This fixes https://bugzilla.redhat.com/show_bug.cgi?id=2256916
    
    Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>