Musl's generic definitions for PRIxPTR and several others in
<inttypes.h> are incorrect for wasm, so introduce a new <inttypes.h>
and <__header_inttypes.h> in the basics module using compiler-provided
definitions.
Fixes#13.
* Fix ssize_t redefinition mismatch.
Align definition with comment and previous define in __typedef_ssize_t.h
* Fix __typedef_ssize_t.h, redundancy in sys/types.h
This populates the repo with a very minimal set of files. This is just
enough to set out a basic outline. Hopefully as we move forward we'll
be replacing many of these parts, but this is just something basic to
get things started.
This tree isn't really usable yet, as it doesn't yet have an easy way
to obtain a compiler-rt/libgcc build.