graphics/osgearth:

• Update to 2.7 (this new version also allows osgearth to build against osg-3.4.0)
• Rename and update patch of src/osgEarth/ThreadingUtils.cpp (pet portlint)
• Fix COMMENT (pet portlint)
• Fix BUILD_DEPENDS for minizip

Changes this release:

http://docs.osgearth.org/en/latest/releasenotes.html#version-2-7-july-2015

PR: 209236
Reviewed by: mat (mentor)
Approved by: lbartoletti@tuxfamily.org (maintainer), adamw (mentor)
Differential Revision: https://reviews.freebsd.org/D6344