Reuse native curses(8) library on NetBSD

[krytarowski]

Summary

The reason for it is limit of detecting ncurses on various systems. For
example, Ubuntu ships with <curses.h> and linkage from <ncurses.h>, <ncurses.h>
isn't detected by CMake. Detecting <curses.h> on NetBSD is reusing
conflicting header from the host curses(8) and pkgsrc's ncurses library.

ncurses ships on most (till conflicting) systems with curses.h. On NetBSD it
might be conflicting, so the ncurses headers are installed with pkgsrc to a
subdirectory "ncurses/".

[krytarowski]

Bruce was involved in the older version with config.h.

[akat1]

I've compiled it successfully on:

Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
Linux AAH 3.13.0-46-generic #75-Ubuntu SMP Tue Feb 10 15:24:04 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

[krytarowski]

I have successfully compiled this patch on FreeBSD.

$   uname -a
FreeBSD 10.1-RELEASE-p19 FreeBSD 10.1-RELEASE-p19 #0: Sat Aug 22 03:55:09 UTC 2015     [e-mail]:/usr/obj/usr/src/sys/GENERIC  amd64

[youri]

Builds on OS X:

Darwin mac.local 15.0.0 Darwin Kernel Version 15.0.0: Wed Aug 26 16:57:32 PDT 2015; root:xnu-3247.1.106~1/RELEASE_X86_64 x86_64

[brucem]

I'd like to land this given approval.

[krytarowski]

Rebase to master

lldb/trunk/source/Core/IOHandler.cpp

 //===-- IOHandler.cpp -------------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 // C Includes
 #ifndef LLDB_DISABLE_CURSES
-#include <ncurses.h>
+#include <curses.h>
 #include <panel.h>
 #endif
 
 // C++ Includes
 #if defined(__APPLE__)
 #include <deque>
 #endif
 #include <string>
switch (ch)
         case KEY_SRSUME:    return "shifted resume key";
         case KEY_SSAVE:     return "shifted save key";
         case KEY_SSUSPEND:  return "shifted suspend key";
         case KEY_SUNDO:     return "shifted undo key";
         case KEY_SUSPEND:   return "suspend key";
         case KEY_UNDO:      return "undo key";
         case KEY_MOUSE:     return "Mouse event has occurred";
         case KEY_RESIZE:    return "Terminal resize event";
+#ifdef KEY_EVENT
         case KEY_EVENT:     return "We were interrupted by an event";
+#endif
         case KEY_RETURN:    return "return";
         case ' ':           return "space";
         case '\t':          return "tab";
         case KEY_ESCAPE:    return "escape";
         default:
             if (isprint(ch))
                 snprintf(g_desc, sizeof(g_desc), "%c", ch);
             else