Rename OS target wasi to wasip1

[michaliskambi]

The OS name for the FPC+WebAssembly target has changed, from wasi to wasip1. As a consequence, currently building FPC trunk with OS_TARGET=wasi (using fpcupdeluxe) fails, with the error The Makefile doesn't support target wasm32-wasi, please run fpcmake first. Stop.

So, fpcupdeluxe needs to also rename wasi -> wasip1.

Background:

• See https://gitlab.com/freepascal.org/fpc/source/-/commit/1f965d262dc09aa2de789e20fa23163280a5b9c7 and nearby commits performing the change in FPC sources.

• Michael Van Canneyt also communicated to me this change over the weekend. In the future, we will have another target: WebAssembly 2.0, which will be called wasip2, so the rename of current target (which is WASI 1.0) from wasi -> wasip1 is necessary to avoid future confusion.

• I note that this is consistent with Rust and Go ( https://doc.rust-lang.org/nightly/rustc/platform-support/wasm32-wasip1.html , https://go.dev/blog/wasi ), so we're in good company.

• Michael Van Canneyt will announce this change soon on the mailing list(s). I wanted to also let you know. We need this fix in fpcupdeluxe soon, to reenable people to build FPC+WebAssembly with fpcupdeluxe. (Which is my recommended way to get FPC+WebAssembly for Castle Game Engine web target.)

[michaliskambi]

I was impatient, so I made a PR to do this rename: #748 .

Note that the PR can be probably simplified in 2 places if you want to rename (and change layout inside) the cross-libs on the server.

I hope this is helpful :)