RLENGTH is wrong for regexes with two identical consecutive '?' matches

[pstumpf]

Consider this testcase:

match($1, /foobar1?1?/) {
        print RLENGTH
}

$ echo foobar11 | mawk -f test.awk 
7

bwk's awk, gawk as well as mawk when compiled with system regex instead of the internal regex engine print the correct result 8.

[ThomasDickey]

thanks - I can reproduce this.