ioctlent: add UAPI support

* Makefile.am (IOCTLSORT_INCLUDEDIR): Define.
(ioctlsort): Use it.
* linux/ioctlent.sh (lookup_ioctls): Look into uapi directory tree.
Strip "uapi/" prefix from output path names.
* linux/ioctlent.h.in: Regenerate from v3.9 headers.
* NEWS: Mention it.
diff --git a/NEWS b/NEWS
index a18121e..1ec49f7 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,7 @@
   * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
     quotactl syscalls.
   * Added new syscall entries to match Linux 3.9.
+  * Regenerated the list of common ioctl names from Linux 3.9.
   * Updated the list of errno constants.
   * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
     PTRACE_O_*, and TCP_* constants.