Fix lots of warnings reported by Clang.

Mostly potentially lossy implicit conversions in headers (long->int). Also dangling else warnings. Struct/class mismatches.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74473 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filefn.cpp

@@ -1390,7 +1390,7 @@ wxChar *wxDoGetCwd(wxChar *buf, int sz)
         buf = new wxChar[sz + 1];
     }
 
-    bool ok wxDUMMY_INITIALIZE(false);
+    bool ok = false;
 
     // for the compilers which have Unicode version of _getcwd(), call it
     // directly, for the others call the ANSI version and do the translation