Update ruby193-rubygem-therubyracer to 0.12.0-14.el6

- Add macros for non-SCL builds and set gem_extdir (shk@redhat.com)
Update ruby193-rubygem-libv8 to 3.16.14.3-12.el6

- Remove the build_info directory on F19 (shk@redhat.com)
- Add gem_extdir global for Fedora 19 (shk@redhat.com)
Update rubygem-libv8 to 3.16.14.3-12.fc18

- Remove the build_info directory on F19 (shk@redhat.com)
- Add gem_extdir global for Fedora 19 (shk@redhat.com)
New package rubygem-libv8, version 3.16.14.3-12.fc19