cmake: Use toolchain with dependencies

[Electroid]

What does this PR do?

This changes how dependencies are built to use a toolchain file, instead of the previous method, which was error-prone.

[robobun]

❌ @Electroid, your commit 9b68dfc has 15 failures in #4182:

test/js/web/streams/streams.test.js - 2 failing on 🐧 20.04 x64

test/js/web/streams/streams.test.js - 2 failing on 🐧 12 x64

test/js/web/streams/streams.test.js - 2 failing on 🐧 22.04 x64

test/js/web/streams/streams.test.js - 1 failing on 🍎 13 x64

test/js/web/streams/streams.test.js - 2 failing on 🐧 22.04 x64-baseline

test/js/web/streams/streams.test.js - 2 failing on 🐧 12 x64-baseline

test/js/web/streams/streams.test.js - 2 failing on 🐧 20.04 x64-baseline

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 20.04 x64

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 12 x64

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 22.04 x64

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 20.04 x64-baseline

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 22.04 x64-baseline

test/js/web/fetch/body-stream.test.ts - 2542 failing on 🐧 12 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-add-file-with-url.test.js - 1 failing on 🍎 14 aarch64

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 12 x64

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 20.04 x64

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 22.04 x64

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 22.04 x64-baseline

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 20.04 x64-baseline

test/js/web/fetch/body-clone.test.ts - 11 failing on 🐧 12 x64-baseline

test/js/bun/http/serve-body-leak.test.ts - 1 failing on 🍎 14 aarch64

test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🍎 14 aarch64

test/cli/run/run-crash-handler.test.ts - timeout on 🪟 x64-baseline

test/cli/run/run-crash-handler.test.ts - timeout on 🪟 x64

test/js/web/fetch/fetch-tcp-stress.test.ts - timeout on 🍎 13 aarch64

test/js/web/fetch/fetch-tcp-stress.test.ts - timeout on 🍎 14 aarch64

test/js/node/watch/fs.watch.test.ts - 1 failing on 🍎 14 aarch64

test/js/node/watch/fs.watch.test.ts - 3 failing on 🍎 13 aarch64

test/js/node/watch/fs.watch.test.ts - 1 failing on 🍎 14 x64

test/js/bun/http/fetch-file-upload.test.ts - 1 failing on 🪟 x64

test/cli/hot/watch.test.ts - 2 failing on 🪟 x64-baseline

test/js/node/test/parallel/child-process-exec-timeout-kill.test.js - 1 failing on 🍎 14 aarch64

test/js/bun/http/bun-serve-static.test.ts - annotation error on 🍎 13 aarch64

test/cli/watch/watch.test.ts - 2 failing on 🪟 x64-baseline

test/cli/watch/watch.test.ts - 2 failing on 🪟 x64

test/js/bun/http/bun-serve-static.test.ts - 8 failing on 🍎 14 aarch64