Fix more -Wstrict-prototypes warnings.

diff --git a/dlls/winsock/tests/protocol.c b/dlls/winsock/tests/protocol.c
index ebc9bd7..da3826f 100644
--- a/dlls/winsock/tests/protocol.c
+++ b/dlls/winsock/tests/protocol.c
@@ -27,7 +27,7 @@
 #include "wine/test.h"
 
 
-static void test_WSAEnumProtocolsA()
+static void test_WSAEnumProtocolsA(void)
 {
     INT ret;
     DWORD len = 0;
@@ -62,7 +62,7 @@
     }
 }
 
-static void test_WSAEnumProtocolsW()
+static void test_WSAEnumProtocolsW(void)
 {
     INT ret;
     DWORD len = 0;