Enable debug build

scripts/build.sh

@@ -21,9 +21,11 @@ for target in "${TARGETS[@]}" ; do
     cp -r "$sourcedir"/* "$targetdir"
     rm "$targetdir"/manifest.part.json
 
-    for file in "$targetdir"/*.js ; do
-	sed -i -e '/\/\/ DEBUG$/d' "$file"
-    done
+    if [ -z "${DEBUG:-}" ] ; then
+	for file in "$targetdir"/*.js ; do
+	    sed -i -e '/\/\/ DEBUG$/d' "$file"
+	done
+    fi
 
     python3 "$BASEDIR/scripts/makemanifest.py" \
 	    "$SHAREDDIR/manifest.part.json" \