[Android] Update JSC version

The JSC version used by React Native is about 3 years old, and doesn't implement
things like Symbol or Typed Arrays, which require polyfills. These polyfills are
sometimes a los less performant, as is the case for Typed Arrays.

Bumping an updated JSC version makes both platforms consistent when it comes to
the JavaScript platform.

android/build.gradle

     repositories {
         google()
         jcenter()
+        maven { url "$rootDir/../node_modules/jsc-android/dist" }
         // React Native (JS, Obj-C sources, Android binaries) is installed from
         // npm.
         maven { url "$rootDir/../node_modules/react-native/android" }
                     def version = new groovy.json.JsonSlurper().parseText(file.text).version
                     details.useVersion version
                 }
+                if (details.requested.group == 'org.webkit'
+                        && details.requested.name == 'android-jsc') {
+                    def file = new File("$rootDir/../node_modules/jsc-android/package.json")
+                    def version = new groovy.json.JsonSlurper().parseText(file.text).version
+                    details.useVersion "r${version.tokenize('.')[0]}"
+                }
             }
         }
     }
 ext {
     buildToolsVersion = "26.0.2"
     compileSdkVersion = 26
-    minSdkVersion    = 16
+    minSdkVersion    = 21
     targetSdkVersion = 26
 
     // The Maven artifact groupdId of the third-party react-native modules which

package-lock.json

       "dev": true,
       "optional": true
     },
+    "jsc-android": {
+      "version": "224109.1.0",
+      "resolved": "https://registry.npmjs.org/jsc-android/-/jsc-android-224109.1.0.tgz",
+      "integrity": "sha512-mhALFynePc/wJsUt9BJuH13mSK/dGWtBO/pcYwVV1I0A7iduyqy3fSoAt1b0yI+/B3TzlGyue/gqjPxsqG1HRQ=="
+    },
     "jsesc": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",

package.json

     "jquery-contextmenu": "2.4.5",
     "jquery-i18next": "1.2.0",
     "js-md5": "0.6.1",
+    "jsc-android": "224109.1.0",
     "jwt-decode": "2.2.0",
     "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#2be752fc88ff71e454c6b9178b21a33b59c53f41",
     "lodash": "4.17.4",