Update libpcap from 1.8.1 to 1.9.1 (#3570)

Tested on ARM.

packages/libpcap.rb

@@ -3,21 +3,13 @@ require 'package'
 class Libpcap < Package
   description 'A portable C/C++ library for network traffic capture.'
   homepage 'http://www.tcpdump.org/'
-  version '1.8.1-0'
-  source_url 'https://www.tcpdump.org/release/libpcap-1.8.1.tar.gz'
-  source_sha256 '673dbc69fdc3f5a86fb5759ab19899039a8e5e6c631749e48dcd9c6f0c83541e'
+  version '1.9.1'
+  source_url 'https://www.tcpdump.org/release/libpcap-1.9.1.tar.gz'
+  source_sha256 '635237637c5b619bcceba91900666b64d56ecb7be63f298f601ec786ce087094'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/libpcap-1.8.1-0-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/libpcap-1.8.1-0-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/libpcap-1.8.1-0-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/libpcap-1.8.1-0-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: '71b746ae9ee9b4240ae99577ff92fc5ce7f637f5191379787842be68baf0a7e2',
-     armv7l: '71b746ae9ee9b4240ae99577ff92fc5ce7f637f5191379787842be68baf0a7e2',
-       i686: '6b0bdf1e1e244d3eac8ade1a2ba5f4442af97567a785638b6fc7619a06381465',
-     x86_64: 'f6b91e914ff739c6b17160da29566af9746b4c38ad7ff24394b43594d62eb8b6',
   })
 
   def self.build