[bug-gawk] Change in behavior of getline

[j . eh]

This is similar to the problem of (g)sub not preserving space
when there were no substitutions.

$ ./gawk --version | head -n 1
GNU Awk 3.1.8
$ echo ' aaa bbb' | ./gawk 'END { getline $2; print}'
 aaa bbb

$ ./gawk --version | head -n 1
GNU Awk 4.0.0
$ echo ' aaa bbb' | ./gawk 'END { getline $2; print}'
aaa bbb

Thanks.

John