Remove global Windows __BEGIN_DECLS/__END_DECLS.

 * comments.

 */

/* MingW doesn't define __BEGIN_DECLS / __END_DECLS. */

#ifndef __BEGIN_DECLS

#  ifdef __cplusplus

#    define __BEGIN_DECLS extern "C" {

#  else

#    define __BEGIN_DECLS

#  endif

#endif

#ifndef __END_DECLS

#  ifdef __cplusplus

#    define __END_DECLS }

#  else

#    define __END_DECLS

#  endif

#endif

#ifdef __CYGWIN__

#error "CYGWIN is unsupported for platform builds"

#endif