[clang] [lld] [lld][WebAssembly] Default to -Bdynamic in wasm-ld (PR #206185)

[Carlo Cabrera via llvm-commits]

carlocab wrote:

> Given that I'd like `wasi-sdk` to remain the same by default, but as-is this'd require `-Bstatic` to be specified by all users.

This can probably be fixed by putting `-Bstatic` in the [configuration file](https://github.com/WebAssembly/wasi-sdk/blob/main/clang.cfg) that ships with wasi-sdk.

https://github.com/llvm/llvm-project/pull/206185