not valid shebang

Commit
mtr: use env for perl (37c88445e30d52c965bcb19b19fa710c3eb4fad9) has a error.
Several files have more 2 parts in shebang.
Shebang should contain 1 or 2 parts. Not 3 or more.

#!/usr/bin/perl

– valid

#!/usr/bin/perl -w

– valid

#!/usr/bin/env perl

– valid

#!/usr/bin/env perl -w

– not valid