replace zig1.wasm to the removal of BoundFn
This also no longer uses zstd compression on this file. The reasoning
for this is:
* It has been demonstrated that the release tarballs are actually
smaller if zig1.wasm gets compressed along with the other files
rather than separately compressed.
* More importantly, leaving zig1.wasm uncompressed may result in a
smaller git repository size, since the repository as a whole could
have savings across the multiple versions of zig1.wasm, which would
not be possible if each one was independently compressed.
* When in doubt, do what is simpler, which is to not have this extra
zstd mechanism. This will remove the only "vendored" code from our
build process, which is a nice property to have.
Co-authored-by: Andrew Kelley <andrew@ziglang.org>