[BRLTTY] build requires gawk, not mawk

[Dave Mielke]

[quoted lines by Dave Mielke on 2019/11/23 at 13:33 -0500]

>It seems that mawk (and maybe pure awk as well), although it claims to support
>extended regular expressions, isn't recognizing \s for whitespace. I just
>installed mawk and shall try to recode the patterns such that they work with
>both.

Fixed. mawk indeed doesn't support \s for whitespace so those uses have been
changed to [:space:]. Also, mawk doesn't support the strtonum() function.

-- 
I believe the Bible to be the very Word of God: http://Mielke.cc/bible/
Dave Mielke            | 2213 Fox Crescent | WebHome: http://Mielke.cc/
EMail: Dave at Mielke.cc  | Ottawa, Ontario   | Twitter: @Dave_Mielke
Phone: +1 613 726 0014 | Canada  K2A 1H7   |