Allow for reproducible builds

REPRODUCIBLE_BUILD=1 ./gradlew clean :build

gradle/reprod/patches/replaymod/0003-Add-witness-plugin.patch

@@ -0,0 +1,41 @@
+From 9baa28ace59f2036e93fff379438c2553f02b6a8 Mon Sep 17 00:00:00 2001
+From: Jonas Herzig <me@johni0702.de>
+Date: Mon, 7 Aug 2017 20:41:46 +0200
+Subject: [PATCH 3/5] Add witness plugin
+
+---
+ build.gradle | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/build.gradle b/build.gradle
+index bfa3914..bee78ee 100755
+--- a/build.gradle
++++ b/build.gradle
+@@ -4,11 +4,13 @@ buildscript {
+     dependencies {
+         classpath files('gradle/reprod/deps/forgegradle.jar')
+         classpath files('gradle/reprod/deps/mixingradle.jar')
++        classpath files('gradle/reprod/deps/gradle-witness.jar')
+     }
+ }
+ 
+ apply plugin: 'net.minecraftforge.gradle.forge'
+ apply plugin: 'org.spongepowered.mixin'
++apply plugin: 'witness'
+ 
+ sourceCompatibility = 1.8
+ targetCompatibility = 1.8
+@@ -56,6 +58,10 @@ dependencies {
+     testCompile 'junit:junit:4.11'
+ }
+ 
++dependencyVerification {
++    includedConfigurations += [configurations.shade, configurations.testCompile]
++}
++
+ tasks['idea'].dependsOn ':ReplayStudio:preshadowJar'
+ 
+ jar {
+-- 
+2.5.5
+