dmg2img: update to 1.6.7

[kencu]

force build against openssl 1.0.x
software needs to be updated to build against openssl 1.1.1
closes: https://trac.macports.org/ticket/59011

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6.8
Xcode 4.2

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?

• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[macportsbot]

Travis Build #8158 Passed.

Lint results

--->  Verifying Portfile for dmg2img
--->  0 errors and 0 warnings found.

Port dmg2img success on xcode10.3. Log
Port dmg2img success on xcode9.4. Log
Port dmg2img success on xcode8.3. Log