Fix Makefile to correctly parse run(); function name.

Add cargo configuration in order to export cwrap.

Author: hugo-dc

.cargo/config

@@ -3,4 +3,5 @@
 rustflags = [
   "-Clink-args=-s NO_DYNAMIC_EXECUTION=1",
   "-Clink-args=-s NODEJS_CATCH_EXIT=0",
+  "-Clink-args=-s EXTRA_EXPORTED_RUNTIME_METHODS=['cwrap']",
 ]

Makefile

@@ -4,13 +4,13 @@ all:
 	cargo build --target=asmjs-unknown-emscripten --release
 	mkdir -p lib
 	find target/asmjs-unknown-emscripten/release -type f -name "rustbn-js.js" | xargs -I {} cp {} lib/index.asm.js
-	@res=$$(sed -n '/run()$$/p' lib/index.asm.js | wc -l); \
+	@res=$$(sed -n '/run();$$/p' lib/index.asm.js | wc -l); \
 	if [ $$res == "0" ]; then \
 		echo "ERROR: could not find run() function in generated code"; \
 		exit 1; \
 	fi\
 
-	sed -ibak 's/run()$$/Module\["arguments"\]=\[\];run();module\.exports=Module;/' lib/index.asm.js
+	sed -ibak 's/run();$$/Module\["arguments"\]=\[\];run();module\.exports=Module;/' lib/index.asm.js
 
 wasm:
 	cargo build --target=wasm32-unknown-emscripten --release