bloaty: fix the port, revbump

[barracuda156]

Description

1. Current portfile ignores that the source prefers external libs. This is not seen on buildbots, since bundled duplicates will be built in absence of external ones. But we do not want this.
2. Set required C++ standard.
3. Fix for < 10.7.
4. Use commit-based build until next release, since 2020 release fails to link against current re2 etc., which use C++17, not C++11.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6
Xcode 3.2

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 in commit message?
• checked your Portfile with port lint --nitpick?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[barracuda156]

Well, no idea what fails with clang specifically, but opened an issue with upstream: google/bloaty#381

[barracuda156]

No responce from upstream, closing.