Remove libctf/mkerrors.sed

Remove libctf/mkerrors.sed

This patch removes libctf/mkerrors.sed, replacing it with a macro in
ctf-api.h.  This simplifies the build and avoids possible unportable
code in the sed script.

2020-10-21  Tom Tromey  <tromey@adacore.com>

	* ctf-api.h (_CTF_ERRORS): New macro.

libctf/ChangeLog
2020-10-21  Tom Tromey  <tromey@adacore.com>

	* mkerrors.sed: Remove.
	* ctf-error.c (_CTF_FIRST): New define.
	(_CTF_ITEM): Define this, not _CTF_STR.
	(_ctf_errlist, _ctf_erridx): Use _CTF_ERRORS.
	(ERRSTRFIELD): Rewrite.
	(ERRSTRFIELD1): Remove.
	* Makefile.in: Rebuild.
	* Makefile.am (BUILT_SOURCES): Remove.
	(ctf-error.h): Remove.