automake-1.17 fails with latest Perl (5.41.8) - Possible precedence problem between ! and numeric eq (==)

[Igor Todorovski]

With the latest version of Perl (Perl 5.41.8), automake 1.17 exits due to an 
error:

./bin/automake-1.17 ; echo $?
Possible precedence problem between ! and numeric eq (==) at 
./bin/automake-1.17 line 6875.
255

This is the relevant code:

  return (!!$val == $neg) ? '##%' : '';