Invoke rewatch executable

Author: nojaf

rewatch/tests/compile.sh

@@ -37,7 +37,7 @@ fi
 # Build from standalone package folder using `rescript build`
 bold "Test: Standalone package can build via rescript from package folder"
 pushd ./packages/standalone > /dev/null
-error_output=$(rescript build 2>&1)
+error_output=$("../../$REWATCH_EXECUTABLE" build 2>&1)
 if [ $? -eq 0 ];
 then
   success "Standalone package built"