ws2_32: Add FROM_PROTOCOL_INFO definition.

[Francois Gouget]

---
 include/winsock2.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/winsock2.h b/include/winsock2.h
index a302331..a69db12 100644
--- a/include/winsock2.h
+++ b/include/winsock2.h
@@ -73,6 +73,8 @@ extern "C" {
 #define WS_SO_CONDITIONAL_ACCEPT   0x3002
 #endif
 
+#define FROM_PROTOCOL_INFO (-1)
+
 /* protocol types */
 
 #ifndef USE_WS_PREFIX
-- 
1.5.5.1