remove Riostream.h from header.

git-svn-id: http://root.cern.ch/svn/root/trunk@21371 27541ba8-7e3a-0410-8455-c3a389f83636

graf/inc/TGraphPolar.h

@@ -12,8 +12,12 @@
 #ifndef ROOT_TGraphPolar
 #define ROOT_TGraphPolar
 
+#ifndef ROOT_TGraphErrors
 #include "TGraphErrors.h"
-#include "Riostream.h"
+#endif
+#ifndef ROOT_Riosfwd
+#include "Riosfwd.h"
+#endif
 #ifndef ROOT_TAttText
 #include "TAttText.h"
 #endif

graf/src/TGraphPolar.cxx

@@ -52,6 +52,7 @@ End_Macro */
 #include "TEllipse.h"
 #include "TH1.h"
 #include "TMath.h"
+#include "Riostream.h"
 
 
 ClassImp(TGraphPolar);