tracker3: fix compiler choice

[barracuda156]

Description

Unbreak the build after 49a25be

The port does not need C++11, however it uses C11 features and fails to build with a C99 compiler.

P. S. @mohd-akram @kencu If you consider that the failure is not due to C11 being required, alternative fix would be to blacklist Xcode gcc, since MacPorts considers it to be C99-capable, and it fails to build this port. So what we have now is wrong in any case.

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?
• 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?

[kencu]

redefinition of typedefs is a C11 feature, certainly.

The buildbot failures seen on macports buildbots are coming from a lack of ‘openat’ on some systems, so the use of legacysupport apparently needs to be broadened upward to replace this function.

[kencu]

fixed openat here, hopefully:

7376c12