-strip ccache from CC and CXX from rbconfig.rb
-
---- ruby-2.0.0-p353/tool/mkconfig.rb~ 2013-03-24 17:42:06.000000000 +0200
-+++ ruby-2.0.0-p353/tool/mkconfig.rb 2014-03-18 10:34:08.489251715 +0200
-@@ -77,6 +77,7 @@
- when /^(?:MAJOR|MINOR|TEENY)$/; next
- when /^RUBY_INSTALL_NAME$/; next if $install_name
- when /^RUBY_SO_NAME$/; next if $so_name
+--- ruby-2.2.5/tool/mkconfig.rb.orig 2016-09-19 13:53:05.152982868 +0200
++++ ruby-2.2.5/tool/mkconfig.rb 2016-09-19 14:01:04.182988081 +0200
+@@ -79,6 +79,7 @@
+ when /^LIBRUBY_D?LD/; next
+ when /^RUBY_INSTALL_NAME$/; next vars[name] = (install_name = val).dup if $install_name
+ when /^RUBY_SO_NAME$/; next vars[name] = (so_name = val).dup if $so_name
+ when /^(CC|CXX)$/; val.sub!(/ccache /, '')
when /^arch$/; if val.empty? then val = arch else arch = val end
when /^sitearch$/; val = '$(arch)' if val.empty?