Add chibi-scheme package (#3643)

Chibi-Scheme is a minimal Scheme implementation for use as an extension
language.

Tested on ARM.

packages/chibi_scheme.rb

+require 'package'
+
+class Chibi_scheme < Package
+  description 'Minimal Scheme Implementation for use as an Extension Language'
+  homepage 'http://synthcode.com/wiki/chibi-scheme'
+  version '0.8'
+  source_url 'https://github.com/ashinn/chibi-scheme/archive/0.8.tar.gz'
+  source_sha256 '8a077859b123216c123c243db391b0fe4c0cf73978c7cdd7b8ea853a48192756'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+
+  def self.build
+    system 'sed -i -e \'/LDCONFIG/d\' Makefile'
+    system 'sed -i \'/^IMAGE_FILES =/c\IMAGE_FILES =\' Makefile' # wasn't able to override via CLI
+    system 'make', '-j1', "PREFIX=#{CREW_PREFIX}", "LIBDIR=#{CREW_LIB_PREFIX}"
+  end
+
+  def self.install
+    system 'make', '-j1', "PREFIX=#{CREW_PREFIX}", "LIBDIR=#{CREW_LIB_PREFIX}", "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end