Clean up warnings in Gradle file.

app/build.gradle

@@ -1,3 +1,5 @@
+import com.android.build.api.dsl.ManagedVirtualDevice
+
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'com.google.protobuf'
@@ -113,7 +115,7 @@ android {
 
         managedDevices {
             devices {
-                pixel3api30 (com.android.build.api.dsl.ManagedVirtualDevice) {
+                pixel3api30 (ManagedVirtualDevice) {
                     device = "Pixel 3"
                     apiLevel = 30
                     systemImageSource = "google-atd"
@@ -172,7 +174,7 @@ android {
         multiDexEnabled true
 
         vectorDrawables.useSupportLibrary = true
-        project.ext.set("archivesBaseName", "Signal");
+        project.ext.set("archivesBaseName", "Signal")
 
         manifestPlaceholders = [mapsKey:"AIzaSyCSx9xea86GwDKGznCAULE9Y5a8b-TfN9U"]
 
@@ -582,7 +584,7 @@ def getLastCommitTimestamp() {
     }
 
     new ByteArrayOutputStream().withStream { os ->
-        def result = exec {
+        exec {
             executable = 'git'
             args = ['log', '-1', '--pretty=format:%ct']
             standardOutput = os
@@ -641,13 +643,13 @@ def loadKeystoreProperties(filename) {
     if (keystorePropertiesFile.exists()) {
         def keystoreProperties = new Properties()
         keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
-        return keystoreProperties;
+        return keystoreProperties
     } else {
-        return null;
+        return null
     }
 }
 
-def getDateSuffix() {
+static def getDateSuffix() {
     def date = new Date()
     def formattedDate = date.format('yyyy-MM-dd-HH:mm')
     return formattedDate