1.15 specific files deleted.
1.16 specific files folded carefully into generic files, with goal of reducing diff with upstream.
Follows upstream 1.16 in making PathError etc. be aliases for the same errors in io/fs.
This fixes#2817 and lets us add io/ioutil to "make test-tinygo" on linux and mac.
The BUILDING.md file is not intended for developer builds but for
release builds. The website contains more specific and more complete
information on how to build TinyGo, so provide links to these pages.
The Windows link doesn't work yet, but should work with the next
release when we update the website.
This replaces the older way which just does the following:
go install .
and
go test -v .
Instead, `make` and `make test` will now build TinyGo statically linked
against LLVM, so that `go install` and `go test -v` should be used
manually.
When building statically against LLVM, LLD is also included now. When
included, the built in wasm-ld will automatically be used instead of the
external command.
There is also support for linking ELF files but because lld does not
fully support armv6m this is not yet enabled (it produces a warning).
