sed compatibility for macOS

Author: mglaman

Makefile

@@ -649,7 +649,7 @@ endif
 
 ${PHP_DIST_DIR}/%.js: source/%.js
 	npx babel $< --out-dir ${PHP_DIST_DIR}
-	sed -i 's|import.meta|(undefined /*import.meta*/)|' ${PHP_DIST_DIR}/$(notdir $@)
+	sed -i '' -e 's|import.meta|(undefined /*import.meta*/)|' ${PHP_DIST_DIR}/$(notdir $@)
 	perl -pi -w -e 's|require\("(\..+?)"\)|require("\1.js")|' ${PHP_DIST_DIR}/$(notdir $@)
 
 ${PHP_DIST_DIR}/%.mjs: source/%.js