ruby: remove minitest deps on gems

minitest can live without gems. Just a minor fix to
solve a require that fails when gem is missing

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

lang/ruby/Makefile

@@ -16,7 +16,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ruby
 PKG_VERSION:=2.1.2
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_LIBVER:=2.1
 

lang/ruby/patches/002-minitest-remove_gems_dep.patch

@@ -0,0 +1,13 @@
+--- ruby-2.1.2.orig/lib/minitest/autorun.rb	2014-09-03 02:22:29.769909573 -0300
++++ ruby-2.1.2/lib/minitest/autorun.rb	2014-09-03 02:22:29.768909580 -0300
+@@ -6,8 +6,9 @@
+ ######################################################################
+ 
+ begin
+-  require 'rubygems'
+   gem 'minitest'
++rescue NameError => e # --disable-gems
++  raise unless e.name == :gem
+ rescue Gem::LoadError
+   # do nothing
+ end