Suppress Cython architecture warnings about linking to the Chapel library on OSX

[lydia-duncan]

Linking a Chapel library file today generates a few warnings that don't impact correctness but are rather annoying and would hide errors that do impact correctness. There are two kinds:

• ld: warning: ignoring file libhwloc.a, file was built for archive which is not the architecture being linked (i386): libhwloc.a
  • Full path stripped. hwloc is an example, we get this message for pretty much every .a file we create for the third-party libraries, runtime components, and actual library file we want to link.
  • If I specifically build for i386, instead it asks for x86_64. It appears both are required in the same .a file to avoid the warning entirely, which I accomplished by building for the two architectures separately and joining them together using lipo (see this comment for how I accomplished that with the library file I compiled)
• ld: warning: object file (libhwloc.a(base64.o)) was built for newer OSX version (10.12) than being linked (10.6)
  • Full path stripped. hwloc is an example, we get this message for pretty much every .a file we create for the third-party libraries, runtime components, and actual library file we want to link.

I have not seen how this process goes on linux yet, but I imagine there will need to be a different solution.

[lydia-duncan]

I am uncertain on the prioritization of this task

[lydia-duncan]

This might be gone, I'm not seeing it in a run on my local Mac (but I am seeing other warnings and it looks like we don't test Python interoperability on Macs currently)