config-win32.h: Don't enable Windows Crypt API if using OpenSSL

As the OpenSSL and NSS Crypto engines are prefered by the core NTLM
routines, to the Windows Crypt API, don't define USE_WIN32_CRYPT
automatically when either OpenSSL or NSS are in use - doing so would
disable NTLM2Session responses in NTLM type-3 messages.
diff --git a/lib/config-win32.h b/lib/config-win32.h
index ba3e7a7..95f1595 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -700,7 +700,9 @@
 #endif
 
 /* Define to use the Windows crypto library. */
+#if !defined(USE_SSLEAY) && !defined(USE_NSS)
 #define USE_WIN32_CRYPTO
+#endif
 
 /* ---------------------------------------------------------------- */
 /*                       ADDITIONAL DEFINITIONS                     */