update libflac.js to 4 and use proper fork

Makefile

 CLEANCSS = ./node_modules/.bin/cleancss
 DEPLOY_DIR = libs
 LIBJITSIMEET_DIR = node_modules/lib-jitsi-meet/
-LIBFLAC_DIR = node_modules/libflac/dist/
+LIBFLAC_DIR = node_modules/libflac/dist/min/
 NODE_SASS = ./node_modules/.bin/node-sass
 NPM = npm
 OUTPUT_DIR = .
 
 deploy-libflac:
 	cp \
-		$(LIBFLAC_DIR)/libflac3-1.3.2.min.js \
-		$(LIBFLAC_DIR)/libflac3-1.3.2.min.js.mem \
+		$(LIBFLAC_DIR)/libflac4-1.3.2.min.js \
+		$(LIBFLAC_DIR)/libflac4-1.3.2.min.js.mem \
 		$(DEPLOY_DIR)
 
 deploy-css:

package-lock.json

       }
     },
     "libflac": {
-      "version": "git+https://github.com/ztl8702/libflac.git#31368097eaf9dcb5ef59365ef60b259cb7b97f07",
-      "from": "git+https://github.com/ztl8702/libflac.git#31368097eaf9dcb5ef59365ef60b259cb7b97f07"
+      "version": "github:ztl8702/libflac.js#ec24bfdab68d22b736b83e327aa32b5aee5943f6",
+      "from": "github:ztl8702/libflac.js#ec24bfdab68d22b736b83e327aa32b5aee5943f6"
     },
     "load-json-file": {
       "version": "2.0.0",

package.json

     "jsc-android": "224109.1.0",
     "jwt-decode": "2.2.0",
     "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#e097a1189ed99838605d90b959e129155bc0e50a",
-    "libflac": "git+https://github.com/ztl8702/libflac.git#31368097eaf9dcb5ef59365ef60b259cb7b97f07",
+    "libflac": "github:ztl8702/libflac.js#ec24bfdab68d22b736b83e327aa32b5aee5943f6",
     "lodash": "4.17.4",
     "moment": "2.19.4",
     "moment-duration-format": "2.2.2",

react/features/local-recording/recording/flac/flacEncodeWorker.js

  * WebWorker that does FLAC encoding using libflac.js
  */
 
+self.FLAC_SCRIPT_LOCATION = '/libs/';
 /* eslint-disable */
-importScripts('/libs/libflac3-1.3.2.min.js');
+importScripts('/libs/libflac4-1.3.2.min.js');
 /* eslint-enable */
 
 // There is a number of API calls to libflac.js, which does not conform