Add oniguruma package (#3602)

Oniguruma is a modern and flexible regular expressions library. This is needed
to update the jq package. Tested on ARM.

packages/oniguruma.rb

+require 'package'
+
+class Oniguruma < Package
+  description 'Oniguruma is a modern and flexible regular expressions library.'
+  homepage 'https://github.com/kkos/oniguruma'
+  version '6.9.3'
+  source_url 'https://github.com/kkos/oniguruma/archive/v6.9.3.tar.gz'
+  source_sha256 'dc6dec742941e24b761cea1b9a2f12e750879107ae69fd80ae1046459d4fb1db'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system './autogen.sh'
+    system './configure',
+      "--prefix=#{CREW_PREFIX}",
+      "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end