Also, add a few missing files to the list of sources to build.

This fix includes some fixes for config.h.win32 that was generating
some compiling errors on MinGW64 and also fix CMakeLists.txt in order to
give better support to MinGW and MSYS2

Define JSON_C_HAVE_INTTYPES_H in json_config.h.win32 only

* Add ifdef C++ extern "C" to headers
  * Use simpler definition of min and max in bits.h
    Larry Lansing, llansing at fuzzynerd dot com

  * Remove automake 1.6 requirement
  * Move autogen commands into autogen.sh. Update README
  * Remove error pointer special case for Windows
  * Change license from LGPL to MIT
    Michael Clark <michael@metaparadigm.com>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@10 327403b1-1117-474d-bef2-5cb71233fd97

Added a Win32/Win64 compliant implementation of vasprintf
  * debug.c - C. Watford (christopher dot watford at gmail dot com)
    Removed usage of vsyslog on Win32/Win64 systems, needs to be handled
    by a configure script
  * json_object.c - C. Watford (christopher dot watford at gmail dot com)
    Added scope operator to wrap usage of json_object_object_foreach, this
    needs to be rethought to be more ANSI C friendly
  * json_object.h - C. Watford (christopher dot watford at gmail dot com)
    Added Microsoft C friendly version of json_object_object_foreach
  * json_tokener.c - C. Watford (christopher dot watford at gmail dot com)
    Added a Win32/Win64 compliant implementation of strndup
  * json_util.c - C. Watford (christopher dot watford at gmail dot com)
    Added cast and mask to suffice size_t v. unsigned int conversion
    correctness
  * json_tokener.c - sign reversal issue on error info for nested object parse
    spotted by Johan Bj�rklund (johbjo09 at kth.se)
  * json_object.c - escape " in json_escape_str
  * Change to automake and libtool to build shared and static library
    Michael Clark <michael@metaparadigm.com>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@4 327403b1-1117-474d-bef2-5cb71233fd97