These constants are used for fadvise() on Linux and were missing from
the ztypes_linux_*.go files.

Including the bluetooth headers is necessary so that cgo can resolve
struct sockaddr_hci.

Fixes golang/go#15114

Change-Id: I1538b5a7b9b24f910c0520d446b2fa5bd8a09013
Reviewed-on: https://go-review.googlesource.com/21753Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>