10816 ctf_dwarf_convert_type() relies on un-initialized id
10817 ctfconvert -i option is mis-handled
10818 Improve ctfconvert error messages
10819 ctfconvert should handle empty dies
10820 ctfconvert -i never converts
10821 bad free in ctf_dwarf_init_die
10815 shouldn't build gcore.c as part of kmdb
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 22,32 ****
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  /*
!  * Copyright 2018 Joyent, Inc.
   */
  
  /*
   * This header file defines the interfaces available from the CTF debugger
   * library, libctf, and an equivalent kernel module.  This API can be used by
--- 22,32 ----
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  /*
!  * Copyright 2019 Joyent, Inc.
   */
  
  /*
   * This header file defines the interfaces available from the CTF debugger
   * library, libctf, and an equivalent kernel module.  This API can be used by
*** 114,124 ****
          ECTF_LABELEXISTS,       /* label already exists */
          ECTF_LCONFLICT,         /* merged labels conflict */
          ECTF_ZLIB,              /* zlib library failure */
          ECTF_CONVBKERR,         /* CTF conversion backend error */
          ECTF_CONVNOCSRC,        /* No C source to convert from */
!         ECTF_NOCONVBKEND        /* No applicable conversion backend */
  };
  
  /*
   * If the debugger needs to provide the CTF library with a set of raw buffers
   * for use as the CTF data, symbol table, and string table, it can do so by
--- 114,124 ----
          ECTF_LABELEXISTS,       /* label already exists */
          ECTF_LCONFLICT,         /* merged labels conflict */
          ECTF_ZLIB,              /* zlib library failure */
          ECTF_CONVBKERR,         /* CTF conversion backend error */
          ECTF_CONVNOCSRC,        /* No C source to convert from */
!         ECTF_CONVNODEBUG        /* No debug info to convert into CTF */
  };
  
  /*
   * If the debugger needs to provide the CTF library with a set of raw buffers
   * for use as the CTF data, symbol table, and string table, it can do so by