win,src: update win_delay_load_hook.cc to work with /clr

Added "#pragma unmanaged" in win_delay_load_hook.cc to support clr

PR-URL: #1819
Reviewed-By: João Reis <[email protected]>

Author: ipetrovic11

src/win_delay_load_hook.cc

@@ -7,6 +7,8 @@
  * This allows compiled addons to work when the host executable is renamed.
  */
 
+#pragma unmanaged
+
 #ifdef _MSC_VER
 
 #ifndef WIN32_LEAN_AND_MEAN