Include <cfloat> in files that need it
Some GeantV source files were inheriting headers from VecGeom. Since was removed from base/Global.h by recent commits, files in GeantV that use the DBL_MAX and didn't include did not compile anymore.
Some GeantV source files were inheriting headers from VecGeom. Since was removed from base/Global.h by recent commits, files in GeantV that use the DBL_MAX and didn't include did not compile anymore.