Add sngrep package (#3827)

sngrep is a tool for displaying SIP calls message flows in a terminal.

Tested on ARM.

packages/sngrep.rb

+require 'package'
+
+class Sngrep < Package
+  description 'An Ncurses SIP Messages flow viewer'
+  homepage 'https://github.com/irontec/sngrep'
+  version '1.4.6'
+  source_url 'https://github.com/irontec/sngrep/releases/download/v1.4.6/sngrep-1.4.6.tar.gz'
+  source_sha256 '638d6557dc68db401b07d73b2e7f8276800281f021fe0c942992566d6b59a48a'
+
+  depends_on 'libpcap'
+  depends_on 'pcre'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system 'AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.16 ./bootstrap.sh'
+    system "./configure CPPFLAGS=-I#{CREW_PREFIX}/include/ncursesw",
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}",
+           '--with-openssl',
+           '--with-pcre',
+           '--disable-logo',
+           '--enable-ipv6'
+    system 'make'
+  end
+
+  def self.check
+    system 'make', 'check'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end