wsnmp32: add stub for SnmpOpen

[Austin English]

Avoids crash in https://bugs.winehq.org/show_bug.cgi?id=37344

-- 
-Austin
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diff --git a/dlls/wsnmp32/wsnmp32.c b/dlls/wsnmp32/wsnmp32.c
index 721842f..3dc54cb 100644
--- a/dlls/wsnmp32/wsnmp32.c
+++ b/dlls/wsnmp32/wsnmp32.c
@@ -45,6 +45,12 @@ SNMPAPI_STATUS WINAPI SnmpCleanup( void )
     return SNMPAPI_SUCCESS;
 }
 
+HSNMP_SESSION WINAPI SnmpOpen( HWND hwnd, UINT msg )
+{
+    FIXME( "%p %u\n", hwnd, msg );
+    return SNMPAPI_FAILURE;
+}
+
 SNMPAPI_STATUS WINAPI SnmpSetRetransmitMode( smiUINT32 retransmit_mode )
 {
     FIXME( "%u\n", retransmit_mode );
diff --git a/dlls/wsnmp32/wsnmp32.spec b/dlls/wsnmp32/wsnmp32.spec
index 197092a..61e48ba 100644
--- a/dlls/wsnmp32/wsnmp32.spec
+++ b/dlls/wsnmp32/wsnmp32.spec
@@ -11,7 +11,7 @@
 120 stub SnmpGetVendorInfo
 200 stdcall SnmpStartup(ptr ptr ptr ptr ptr)
 201 stdcall SnmpCleanup()
-202 stub SnmpOpen
+202 stdcall SnmpOpen(ptr long)
 203 stub SnmpClose
 204 stub SnmpSendMsg
 205 stub SnmpRecvMsg
diff --git a/include/winsnmp.h b/include/winsnmp.h
index 64765de..79a5e88 100644
--- a/include/winsnmp.h
+++ b/include/winsnmp.h
@@ -27,6 +27,7 @@ typedef int          smiINT, *smiLPINT;
 typedef smiINT       smiINT32, *smiLPINT32;
 typedef unsigned int smiUINT32, *smiLPUINT32;
 typedef smiUINT32    SNMPAPI_STATUS;
+typedef HANDLE       HSNMP_SESSION;
 
 #define SNMPAPI_NO_SUPPORT  0
 #define SNMPAPI_V1_SUPPORT  1
@@ -44,6 +45,7 @@ typedef smiUINT32    SNMPAPI_STATUS;
 #define SNMPAPI_SUCCESS 1
 
 SNMPAPI_STATUS WINAPI SnmpCleanup(void);
+HSNMP_SESSION  WINAPI SnmpOpen(HWND,UINT);
 SNMPAPI_STATUS WINAPI SnmpSetRetransmitMode(smiUINT32);
 SNMPAPI_STATUS WINAPI SnmpSetTranslateMode(smiUINT32);
 SNMPAPI_STATUS WINAPI SnmpStartup(smiLPUINT32,smiLPUINT32,smiLPUINT32,smiLPUINT32,smiLPUINT32);