Fixed inf object error if inf file name with extension other than ".inf" all in lower case.
Fixed inf object error if inf file name with extension other than ".inf" all in lower case.

git-svn-id: f3880c1fc5096ce2109c8aec392d8e07f619f417@1543 c2973edb-eda0-4c78-bc6a-9341b269661f

bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools