Jeff Epler
adfa6ef019
Fix all natmod tests to run on x64
My testing sequence is
```
git clean -dxf examples
arch=x64; make -C examples/natmod/features1 ARCH=$arch && make -C examples/natmod/features2 ARCH=$arch && make -C examples/natmod/btree ARCH=$arch && make -C examples/natmod/framebuf ARCH=$arch && make -C examples/natmod/uheapq ARCH=$arch && make -C examples/natmod/urandom ARCH=$arch && make -C examples/natmod/ure ARCH=$arch && make -C examples/natmod/uzlib ARCH=$arch
(cd tests && ./run-natmodtests.py "$@" extmod/{btree*,framebuf*,uheapq*,ure*,uzlib*}.py)
```