make WREN_API_DLLEXPORT required, fixes statically linked versions
_-
WREN_VERSION_PATCH)
#ifndef WREN_API
- #if defined(_MSC_VER) || defined(WREN_API_DLLEXPORT)
+ #if defined(_MSC_VER) && defined(WREN_API_DLLEXPORT)
#define WREN_API __declspec( dllexport )
#else
#define WREN_API
