remove SIGNAL_* buildConfigField's

build.gradle

@@ -210,10 +210,6 @@ android {
         project.ext.set("archivesBaseName", "Deltachat");
 
         buildConfigField "long", "BUILD_TIMESTAMP", getLastCommitTimestamp() + "L"
-        buildConfigField "String", "SIGNAL_URL", "\"https://textsecure-service.whispersystems.org\""
-        buildConfigField "String", "SIGNAL_CDN_URL", "\"https://cdn.signal.org\""
-        buildConfigField "String", "SIGNAL_SERVICE_STATUS_URL", "\"uptime.signal.org\""
-        buildConfigField "String", "USER_AGENT", "\"OWA\""
         buildConfigField "boolean", "DEV_BUILD", "false"
 
         ndk {

src/org/thoughtcrime/securesms/util/Util.java

@@ -254,11 +254,6 @@ public class Util {
     return new SecureRandom();
   }
 
-  public static int getDaysTillBuildExpiry() {
-    int age = (int)TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - BuildConfig.BUILD_TIMESTAMP);
-    return 90 - age;
-  }
-
   public static boolean isMainThread() {
     return Looper.myLooper() == Looper.getMainLooper();
   }