Add a sanity check to reloadfile: dependent file must be != current file....

Add a sanity check to reloadfile: dependent file must be != current file. Fixes an issue with re-loading FFT.C without libfftw.


git-svn-id: http://root.cern.ch/svn/root/trunk@23500 27541ba8-7e3a-0410-8455-c3a389f83636