Deprecate ustat syscall interface

As for sysctl, ustat has been deprecated in favor of {f}statfs.  Also
some newer ports which uses generic interface builds a stub version that
returns ENOSYS.

This patch deprecates ustat interface by removing ustat.h related headers,
adding a compatibility symbol, and avoiding new ports to build and provide
the symbol.

Checked on x86_64-linux-gnu and i686-linux-gnu.  Also checked with a
check-abi on all affected ABIs.

	* NEWS: Add ustat.h deprecation entry.
	* bits/ustat.h: Remove file.
	* misc/sys/ustat.h: Likewise.
	* misc/ustat.h: Likewise.
	* sysdeps/unix/sysv/linux/generic/ustat.c: Likewise.
	* misc/Makefile (headers): Remove ustat.h and sys/ustat.h.
	* misc/ustat.c (__ustat): Rename to __old_ustat and export only in
	compatibility mode.
	* sysdeps/unix/sysv/linux/ustat.c (__ustat): Likewise.
	* sysdeps/unix/sysv/linux/mips/ustat.c: Define DEV_TO_KDEV and use
	generic Linux implementation.

1 files changed, 4 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 363e918..5155c86 100644
--- a/NEWS
+++ b/NEWS
@@ -59,6 +59,10 @@ Deprecated and removed features, and other changes affecting compatibility:
 
 * The tilegx*-*-linux-gnu configurations are no longer supported.
 
+* The obsolete function ustat is no longer available to newly linked
+  binaries; the headers <ustat.h> and <sys/ustat.h> have been removed.  This
+  function has been deprecated in favor of fstatfs and statfs.
+
 Changes to build and runtime requirements:
 
   [Add changes to build and runtime requirements here]