Include wx/utils.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38972 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/mimetype.cpp

@@ -45,6 +45,7 @@
     #include "wx/string.h"
     #include "wx/intl.h"
     #include "wx/log.h"
+    #include "wx/utils.h"
 #endif
 
 #include "wx/file.h"
@@ -53,7 +54,6 @@
 #include "wx/ffile.h"
 #include "wx/textfile.h"
 #include "wx/dir.h"
-#include "wx/utils.h"
 #include "wx/tokenzr.h"
 #include "wx/iconloc.h"
 #include "wx/filename.h"