dectalk: multiple fixes to the port

[barracuda156]

Description

Backport some upstream fixes.
Enable normal patching.
Fix building with gcc.
Fix build on Darwin < 16.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6
Xcode 3.2

Verification

Have you

• followed our Commit Message Guidelines?
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• 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?

[macportsbot]

Notifying maintainers:
@mohd-akram for port dectalk.

[mohd-akram]

Builds are failing, converted to draft.

[barracuda156]

@mohd-akram I will rebase today, dropping my patches in favor of new backports from upstream, and we can see from there.

[reneeotten]

ping

[barracuda156]

I think by now all patches have been merged to upstream, so what is left from my side is a) fixing EOLs so that patching is less painful (no effect on the code), b) blacklisting archaic Xcode gcc (no effect on anything 10.6+ in MacPorts) and c) using legacy-support to provide clock_gettime (show be uncontroversial, and no effect on Darwin > 15).

Opportunistic linking to pulseaudio is fixed in upstream, but requires autotools build to regenerate configure sctipt.