exiv2: enable BMFF support

[mascguy]

Description

Enable BMFF support, to improve functionality in dependent ports like darktable.

Thus far, upstream releases haven't enabled this by default, due to potential concerns related to patents. However, the topic has been thoroughly discussed and vetted, enough so that upstream has now enabled by default on Master.

Patent-related discussions: Exiv2/exiv2#1679

Tested on macOS Releases

• Intel x86_64: 10.6 through Monterey
• PPC: 10.5

[macportsbot]

Notifying maintainers:
@ryandesign for port exiv2.

[mascguy]

@jmroot Added you as well, so that you can also review the patent-related discussion.

[mascguy]

@evanmiller @barracuda156 Tested on 10.5 PPC as well, and looks good.

[barracuda156]

@evanmiller @barracuda156 Tested on 10.5 PPC as well, and looks good.

I can check on 10.6.8 Rosetta, let me build cmake.

UPD. Yes, it builds fine.

[mascguy]

@ryandesign and @jmroot, thoughts on this?

[mascguy]

The key takeaway - from the final comment in the patent discussion - is as follows:

The first version of ISOBMFF was 2004 and the container format was first used by MPEG in the 1990s. So, even if a patent has been infringed, the holder's "ownership" has almost certainly expired.

Given that, I think we're safe.