winscard: Add extended stub for SCardEstablishContext.

dlls/winscard/winscard.c

@@ -50,3 +50,11 @@ BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     return TRUE;
 }
+
+LONG WINAPI SCardEstablishContext(DWORD dwScope, LPCVOID pvReserved1,
+    LPCVOID pvReserved2, LPSCARDCONTEXT phContext)
+{
+    FIXME("(%x,%p,%p,%p) stub\n", dwScope, pvReserved1, pvReserved2, phContext);
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return SCARD_F_INTERNAL_ERROR;
+}

dlls/winscard/winscard.spec

@@ -12,7 +12,7 @@
 @ stub SCardControl
 @ stub SCardDisconnect
 @ stub SCardEndTransaction
-@ stub SCardEstablishContext
+@ stdcall SCardEstablishContext(long ptr ptr ptr)
 @ stub SCardForgetCardTypeA
 @ stub SCardForgetCardTypeW
 @ stub SCardForgetReaderA