Updating devel/p5-Hash-Merge from 0.11 to 0.12

pkgsrc changes:
- Adjust module file permission

Upstream changes:
0.12  Mon Feb 15 19:23:52 CST 2010
    Thanks to MONS for addressing these:
    - rt 39183 fallback to Clone::PP if needed/possible
    - rt 43056 OO support for more sane behavior non-trampling

    This version is a cleaned up version of MONS' patch in rt 43056 plus:

    Added tests for OO behavior.
    Cleaned up POD a little
    perltidy

(sno)