For now disable EC_GFp_nistp224_method() for WIN32 so the WIN32 build
completes without linker errors.

crypto/ec/ec.h

diff --git a/crypto/ec/ec.h b/crypto/ec/ec.h
index 6409eee..5f92cdd 100644
--- a/crypto/ec/ec.h
+++ b/crypto/ec/ec.h
@@ -155,8 +155,10 @@
 /** Returns 64-bit optimized methods for nistp224
  *  \return  EC_METHOD object
  */
+#ifndef OPENSSL_SYS_WIN32
 const EC_METHOD *EC_GFp_nistp224_method(void);
 #endif
+#endif
 
 
 /********************************************************************/