Update gradle and external deps

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/build.gradle

@@ -6,7 +6,7 @@ apply from: 'nonnull.gradle'
 final def keystorePropertiesFile = rootProject.file("keystore.properties")
 
 android {
-    buildToolsVersion '28.0.1'
+    buildToolsVersion '28.0.3'
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8

app/tools/libwg-go/Makefile

@@ -2,7 +2,7 @@
 #
 # Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
 
-FILES := $(filter-out %/main.go,$(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go))
+FILES := $(filter-out %/main.go %/queueconstants.go,$(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go))
 
 NDK_GO_ARCH_MAP_x86 := 386
 NDK_GO_ARCH_MAP_x86_64 := amd64

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/queueconstants.go

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2017-2018 WireGuard LLC. All Rights Reserved.
+ */
+
+package main
+
+/* Reduce memory consumption for Android */
+
+const (
+        QueueOutboundSize          = 1024
+        QueueInboundSize           = 1024
+        QueueHandshakeSize         = 1024
+        MaxSegmentSize             = 2200
+        PreallocatedBuffersPerPool = 4096
+)

build.gradle

@@ -7,7 +7,7 @@ allprojects {
 
 buildscript {
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:3.2.0'
     }
     repositories {
         google()

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
+#Mon Oct 01 15:59:48 CEST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip