Enables crash minidump for Win32 vpntest. Minidump files will be saved to the 'C:\Users\<username>\AppData\Local\Temp\vpn_debug' (for normal user) or 'src\bin\vpn_debug\' (for administrator user).

src/Mayaqua/Microsoft.h

@@ -886,6 +886,7 @@ bool MsIsWinXPOrWinVista();
 bool MsGetFileInformation(void *h, void *info);
 void MsSetErrorModeToSilent();
 void MsSetEnableMinidump(bool enabled);
+bool MsIsMinidumpEnabled();
 void MsWriteMinidump(wchar_t *filename, void *ex);