Update gawk from 4.1.4-1 to 4.2.0

This is a major release and contains a large number of fixes, new
features, and changes to behavior.

Tested as working on Samsung Chromebook Plus (aarch64).

packages/gawk.rb

@@ -3,21 +3,13 @@ require 'package'
 class Gawk < Package
   description 'The gawk utility interprets a special-purpose programming language that makes it possible to handle simple data-reformatting jobs with just a few lines of code.'
   homepage 'https://www.gnu.org/software/gawk/'
-  version '4.1.4-1'
-  source_url 'http://ftp.gnu.org/gnu/gawk/gawk-4.1.4.tar.xz'
-  source_sha256 '53e184e2d0f90def9207860531802456322be091c7b48f23fdc79cda65adc266'
+  version '4.2.0'
+  source_url 'https://ftp.gnu.org/gnu/gawk/gawk-4.2.0.tar.xz'
+  source_sha256 'd4f3cd31c001fd0ed52832d4fbfbdfeaa38ad541c182f80ff8fdf87324a6a9f2'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/gawk-4.1.4-1-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/gawk-4.1.4-1-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/gawk-4.1.4-1-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/gawk-4.1.4-1-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: 'c2ced685d98ec85de68b5eac56c6d297619502b3bee290145abfe9d35a52d960',
-     armv7l: 'c2ced685d98ec85de68b5eac56c6d297619502b3bee290145abfe9d35a52d960',
-       i686: '1c032e90b3ee55a7a916a7d6e36e9accaa21926ef9c6099ebb289330320ecfce',
-     x86_64: '61eb233ff9bc2f0f23e3b169bfaa0ed1dd4abcc92583a26aaf0e287905fa7d82',
   })
 
   depends_on 'libsigsegv'