loader: Don't combine dllexport with def file usage.

Author: rpavlik

src/loader/loader_platform.hpp

@@ -31,8 +31,6 @@
 #define LOADER_EXPORT __attribute__((visibility("default")))
 #elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)
 #define LOADER_EXPORT __attribute__((visibility("default")))
-#elif defined(_WIN32) && defined(XRAPI_DLL_EXPORT)
-#define LOADER_EXPORT __declspec(dllexport)
 #else
 #define LOADER_EXPORT
 #endif