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/ioctl.c b/ioctl.c
index 2280439..e9a503d 100644
--- a/ioctl.c
+++ b/ioctl.c
@@ -95,6 +95,8 @@
 	case 'o':
 	case 'O':
 		return ubi_ioctl(tcp, code, arg);
+	case '=':
+		return ptp_ioctl(tcp, code, arg);
 	default:
 		break;
 	}