Fix logic for ignoring warnings in dictionary creation and exclude overlength strings warnings form generated targets

the if condition was never true so 'elif' was never executed by cmake or an error would have been raised

removed the -+ signs from variables for the result variable. This variable is passed as a macro to the compilation test and produces a warning otherwise. If using Werror this then fails

Remove minimum required cmake version from DD4hepBuild, this interferes with other packages depending on DD4hep

whitepsace

also remove where visited the $ statements in the files. They are useless, since git does not support them.
Fixed some tests, which no longer properly worked in the conditions area.