hg: jdk8/tl: 8011178: improve common/bin/hgforest.sh python detection (MacOS)

[mike . duigou]

Changeset: 760074bec012
Author:    mduigou
Date:      2013-04-01 21:11 -0700
URL:       http://hg.openjdk.java.net/jdk8/tl/rev/760074bec012

8011178: improve common/bin/hgforest.sh python detection (MacOS)
Reviewed-by: ohair

! common/bin/hgforest.sh