mgmtapi: AddSnmpMgrOpen stub.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56062

dlls/mgmtapi/mgmtapi.c

@@ -19,10 +19,17 @@
 #include <stdarg.h>
 #include "windef.h"
 #include "winbase.h"
+#include "mgmtapi.h"
 #include "wine/debug.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(mgmtapi);
 
+LPSNMP_MGR_SESSION WINAPI SnmpMgrOpen(char *hostname, char *community, int timeout, int retries)
+{
+    FIXME("stub: %s, %s, %d, %d\n", hostname, community, timeout, retries);
+    return NULL;
+}
+
 BOOL WINAPI SnmpMgrTrapListen(HANDLE *available)
 {
     FIXME("stub: %p\n", available);

dlls/mgmtapi/mgmtapi.spec

@@ -3,7 +3,7 @@
 @ stub SnmpMgrGetTrap
 @ stub SnmpMgrGetTrapEx
 @ stub SnmpMgrOidToStr
-@ stub SnmpMgrOpen
+@ stdcall SnmpMgrOpen(str str long long)
 @ stub SnmpMgrRequest
 @ stub SnmpMgrStrToOid
 @ stdcall SnmpMgrTrapListen(ptr)