* Make __wasi_linkcount_t a uint64_t (#134)
Refs: https://github.com/WebAssembly/WASI/pull/127
* Generate the WASI interface from witx.
This replaces the hand-maintained <wasi/core.h> header with a
<wasi/api.h> generated from witx.
Most of the churn here is caused by upstream WASI renamings; hopefully
in the future ABI updates will be less noisy.
Don't ignore paths which don't have the required rights. This means
that if the lookup finds a path that doesn't have the required
rights, it'll just proceed to the actual operation which will fail
with `ENOTCAPABLE`.
Intuitively, use cases which would depend on having multiple
overlapping matching paths for a given lookup and intelligently
picking the one with the required rights seems like they should
be uncommon.
This is simpler overall, and requires less code.
* Avoid a `strdup` call in `__wasilibc_populate_libpreopen`.
Optimize `__wasilibc_populate_libpreopen` to avoid calling `strdup` in
the common case where it's called from `__wasilibc_populate_libpreopen`.
* Convert an if into a ?:.
wasi-libc's copy of libpreopen has evolved so many local changes that
it's no longer worth keeping the upstream code structure and marking
changes with __wasilibc_unmodified_upstream.
This PR merges the source files into a single file, removes all
__wasilibc_unmodified_upstream code, eliminates the ability to
allocate multiple preopen lists, eliminates the need for
__wasilibc_init_preopen, eliminates the non-standard eaccess, and
makes several other cleanups. It also enables NDEBUG so that internal
assertions are disabled in release builds.
