PalmOS compilation fixes (wx-trunk-out.diff part of patch 1894861)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52226 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/file.cpp

@@ -80,6 +80,8 @@
     char* mktemp( char * path ) { return path ;}
     #include <stat.h>
     #include <unistd.h>
+#elif defined(__WXPALMOS__)
+    #include "wx/palmos/missing.h"
 #else
     #error  "Please specify the header with file functions declarations."
 #endif  //Win/UNIX