local patch to make curl build with sspi+openssl

Ref: curl/curl#1276

Author: vszakats

curl.diff

@@ -0,0 +1,16 @@
+diff --git a/lib/urldata.h b/lib/urldata.h
+index 648b3e81d..7f87913a9 100644
+--- a/lib/urldata.h
++++ b/lib/urldata.h
+@@ -136,8 +136,10 @@
+ #undef realloc
+ #endif /* USE_AXTLS */
+ 
+-#ifdef USE_SCHANNEL
++#if defined(USE_SCHANNEL) || defined(USE_WINDOWS_SSPI)
+ #include "curl_sspi.h"
++#endif
++#ifdef USE_SCHANNEL
+ #include <schnlsp.h>
+ #include <schannel.h>
+ #endif