Decode ptp ioctls

* defs.h (ptp_ioctl): New prototype.
* ioctl.c (ioctl_decode): Call ptp_ioctl when code is '='.
* Makefile.am (strace_SOURCES): Add ptp.c.
(EXTRA_DIST): Add linux/ptp_clock.h.
* ptp.c: New file.
* linux/ptp_clock.h: New file.

Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
diff --git a/defs.h b/defs.h
index 95d2571..330441f 100644
--- a/defs.h
+++ b/defs.h
@@ -703,6 +703,7 @@
 extern int mtd_ioctl(struct tcb *, long, long);
 extern int ubi_ioctl(struct tcb *, long, long);
 extern int loop_ioctl(struct tcb *, long, long);
+extern int ptp_ioctl(struct tcb *, long, long);
 
 extern int tv_nz(struct timeval *);
 extern int tv_cmp(struct timeval *, struct timeval *);