Look for bin/binaryen_js.js directly, instead of expecting us to copy it.

[kripken]

Without this, just building and running the test suite didn't work.

[dcodeIO]

Makes me wonder whether file(RENAME ...)ing the file once compilation is complete would be more straight-forward, so everyone building it just gets the file name they'd expect. I assume there is a problem with that?

[kripken]

@dcodeIO If that works it sounds good. I don't know much cmake though, and after reading the docs, I'm still not sure how to make that happen after the build? How does it order the operations?

[kripken]

Let's merge this in for now, as it improves the status quo, but if we can do even better with a cmake file rename then let's look into that too!

[dcodeIO]

Appears we may instead append

set_target_properties(binaryen_js PROPERTIES OUTPUT_NAME "binaryen")

to get

[ 98%] Linking CXX executable bin/binaryen.js

Documentation says

OUTPUT_NAME sets the real name of a target when it is built and can be used to help create two targets of the same name even though CMake requires unique logical target names.

I don't know much about CMake and whether there may be issues with this, but works for me locally.