more gcc 4.3 warning fixes. Remains only some warning in Cint, Reflex

base/src/TContextMenu.cxx

base/src/TString.cxx

base/src/TSystem.cxx

clib/src/mmtrace.c

g3d/src/TView3D.cxx

gpad/src/TCanvas.cxx

graf/src/TGraph.cxx

graf/src/TLatex.cxx

graf/src/TLegend.cxx

gui/src/TGFSContainer.cxx

gui/src/TGToolTip.cxx

hist/src/TBinomialEfficiencyFitter.cxx

hist/src/TFormula.cxx

hist/src/TH1.cxx

hist/src/THStack.cxx

hist/src/THnSparse.cxx

histpainter/src/TPainter3dAlgorithms.cxx

io/src/TBufferFile.cxx

io/src/TFile.cxx

io/src/TGenCollectionProxy.cxx