Make error_t available on all supported hosts.

It occurred to me that by using a GCC 4.5 feature (pragma push_macro)
we could make error_t available on all supported hosts, without having
to stop using asm/errno.h on Linux.  bits/errno-enum.h is a generated
file that constructs the error_t enumeration from the macros.  This is
not possible without pragma push_macro, so errno.h falls back to using
'int' for error_t when the compiler feature is unavailable.  You
probably don't want to read the generated bits/errno-enum.h.

We could conceivably change __errno_location to return an error_t,
which would mean 'p errno' in GDB would print symbolic values without
needing to cast it, but I hesitate to make the apparent type of errno
not be 'int'.

	* scripts/make-errno-enum.sh: New script.
	* Makeconfig: Generate bits/errno-enum.h in before-compile phase.
	* stdlib/Makefile: Install bits/errno-enum.h.
	* stdlib/errno.h: Define error_t here, using bits/errno-enum.h when
	possible.

	* sysdeps/mach/hurd/errnos.awk: Do not define enum __errno_codes
	nor error_t.
	* sysdeps/mach/hurd/bits/errno.h: Regenerate.

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