dzip 3.0 fails to build on macOS (x86_64 and ppc): Undefined symbols: "_static_assert"

[barracuda156]

Failure confirmed on 10.8.5 (x86_64), 10.6.8 (Rosetta) and 10A190 (ppc): https://trac.macports.org/ticket/66055

Undefined symbols for architecture x86_64:
  "_static_assert", referenced from:
      _create_clientdata_msg in decode.c.o
      _dem_sound in encode.c.o
      _dem_clientdata in encode.c.o
      _diff_entities in encode.c.o
ld: symbol(s) not found for architecture x86_64

Attached log from 10.8.5 + Xcode 5.1.1:
main.log

[kugelrund]

After seeing the answer in https://trac.macports.org/ticket/66055 am I right to assume that this can be closed? I do not see what could be changed in the dzip source anyways. To my knowledge, after including <assert.h>, calling static_assert is standard C11 and should work with any standard-conforming compiler.

[barracuda156]

@kugelrund Thank you for responding! Yeah, building in Macports is fine now, so unless you care to import the fix from our legacysupport, we are done.