[RFC 3/5] xtensa: support dynconfig on windows

[Nick Clifton]

Hi Max,

> 2017-05-22  Max Filippov  <jcmvbkbc@gmail.com>
> bfd/
> 	* xtensa-config.c (windows.h): New #include'd header.
> 	(RTLD_LAZY): New macro definition.
> 	(dlopen, dlsym, dlclose, dlerror): New functions.

Approved - please apply.

Cheers
  Nick