Attempt to locate Emscripten if EMSCRIPTEN_DIR is not set (#1153)
Attempt to locate Emscripten if EMSCRIPTEN_DIR is not set (#1153)

* Attempt to locate emscripten if EMSCRIPTEN_DIR is not set

* Remove previous

WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype