Fix harmless unused parameter warnings in minimal build.

No real changes, just add some wxUnusedVar() to avoid warnings about
parameters unused in some non-default build configurations.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66090 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -1307,6 +1307,8 @@ bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
 
     return hasIO;
 #else // !HAS_PIPE_INPUT_STREAM
+    wxUnusedVar(execData);
+
     return false;
 #endif // HAS_PIPE_INPUT_STREAM/!HAS_PIPE_INPUT_STREAM
 }