Dump details for Bluetooth socket operations

* configure.ac (AC_CHECK_HEADERS): Add bluetooth/bluetooth.h.
* xlat/bt_protocols.in: New file.
* net.c [AF_BLUETOOTH && HAVE_BLUETOOTH_BLUETOOTH_H]: Include bluetooth
headers.
[PF_BLUETOOTH && HAVE_BLUETOOTH_BLUETOOTH_H]: Include "xlat/bt_protocols.h".
(printsock) [AF_BLUETOOTH && HAVE_BLUETOOTH_BLUETOOTH_H]: Dump details
for AF_BLUETOOTH sockets.
(sys_socket) [PF_BLUETOOTH && HAVE_BLUETOOTH_BLUETOOTH_H]: Decode
protocol for PF_BLUETOOTH sockets.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
diff --git a/configure.ac b/configure.ac
index 54e9941..98669fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -227,6 +227,7 @@
 AC_CHECK_HEADERS(m4_normalize([
 	asm/cachectl.h
 	asm/sysmips.h
+	bluetooth/bluetooth.h
 	elf.h
 	inttypes.h
 	ioctls.h