I’m building against the Newlib libc, for the Wii, and it seems the issue leading to all of those functions not working is:
(.text.clock+0x18): undefined reference to `_times_r'

Threading is disabled, and reentrant functions as well, which could explain that.

But still, when pyconfig.h doesn’t define any HAVE_ macro to get the system time, I would expect py_process_time() to return None or something instead of failing to build.