Log Message:
Updated ruby-heckle to 1.4.3.

Upstream changes:
1.4.3 / 2009-06-23
- Enhancements
    * Added autotest/heckle plugin
    * Skipping testing on 1.9

1.4.2 / 2009-02-08
- Fixes
    * Fixed Ruby2Ruby dependency and Ruby2Ruby references (name changed).
    * Fix bug 11435 where [:iter, [:call], ...] would cause an endless loop.