rewatch: Could not find bsc.exe

[cknitt]

When installing the latest rescript master npm package and trying to build my project using rewatch, bsc.exe is not found:

RUST_BACKTRACE=1 yarn rewatch

thread 'main' panicked at src/helpers.rs:175:14:
Could not find bsc.exe
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: rewatch::helpers::get_bsc
   3: rewatch::build::initialize_build
   4: rewatch::build::build
   5: rewatch::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

(whereas building with bsb works fine)

Most likely this is because the binaries are now located in the platform-dependent packages.

[cknitt]

I think this is already fixed in #7422 though

[cknitt]

Fixed with #7422