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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39111 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/dcprint.cpp

@@ -14,13 +14,13 @@
 
 #if wxUSE_PRINTING_ARCHITECTURE
 
+#include "wx/dcprint.h"
+
 #define INCL_DEV
 #define INCL_GPI
 #define INCL_PM
 #include<os2.h>
 
-#include "wx/dcprint.h"
-
 #ifndef WX_PRECOMP
     #include "wx/app.h"
     #include "wx/math.h"
@@ -278,7 +278,7 @@ static bool wxGetDefaultDeviceName( wxString& rsDeviceName, wxString& rsPortName
         GlobalFree(pd.hDevMode);
         pd.hDevMode=NULL;
     }
-    return ( deviceName != wxT("") );
+    return !deviceName.empty();
 */
     return true;
 } // end of wxGetDefaultDeviceName