Universal build (i386 + x86_64) on OS X broken

[mojca]

Building MoarVM as universal binary on OS X worked in 2016.07, but fails with 2016.09:

src/jit/emit_x64.dasc:2381:181: warning: shift count >= width of type [-Wshift-count-overflow]
        dasm_put(Dst, 3847, Dt20([invoke->code_register]), invoke->spesh_cand, (unsigned int)((uintptr_t)&MVM_frame_invoke_code), (unsigned int)(((uintptr_t)&MVM_frame_invoke_code)>>32));
                                                                                                                                                                                    ^ ~~
39 warnings generated.
linking libmoar.dylib
linking moar
ld: warning: ignoring file /opt/local/lib/libmoar.dylib, file was built for unsupported file format ( 0xcf 0xfa 0xed 0xfe 0x 7 0x 0 0x 0 0x 1 0x 3 0x 0 0x 0 0x 0 0x 6 0x 0 0x 0 0x 0 ) which is not the architecture being linked (i386): /opt/local/lib/libmoar.dylib
Undefined symbols for architecture i386:
  "_MVM_crash_on_error", referenced from:
      _main in main.o
  "_MVM_jit_support", referenced from:
      _main in main.o
  "_MVM_vm_create_instance", referenced from:
      _main in main.o
  "_MVM_vm_destroy_instance", referenced from:
      _main in main.o
  "_MVM_vm_dump_file", referenced from:
      _main in main.o
  "_MVM_vm_exit", referenced from:
      _main in main.o
  "_MVM_vm_run_file", referenced from:
      _main in main.o
  "_MVM_vm_set_clargs", referenced from:
      _main in main.o
  "_MVM_vm_set_exec_name", referenced from:
      _main in main.o
  "_MVM_vm_set_lib_path", referenced from:
      _main in main.o
  "_MVM_vm_set_prog_name", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [moar] Error 1

I would like to add @coke to discussion as well.

[barracuda156]

@mojca Has the reason of the issue been discovered ever since?