Windows build of extension of http_message

Hi Anatol, I've added the new http_message package to pecl. It depends on the psr extension, not only at runtime but it also needs to php_psr.h header file to build. On Linux, the header file is automatically copied the PHP include dir on make install, but on Windows you need to do that manually if you just copy php_psr.dll. Is there a way to fix the Windows build? As reference, the package is build on AppVeyor; https://ci.appveyor.com/project/jasny/http-message Thanks, Arnold [Arnold Daniels - Chat @ Spike](https://www.spikenow.com/?ref=spike-organic-signature&_ts=2g6py) [2g6py]