Declare gradle license via .reuse/dep5

.reuse/dep5

@@ -9,6 +9,16 @@ Source: https://pgpainless.org
 # Copyright: $YEAR $NAME <$CONTACT>
 # License: ...
 
+# Gradle build tool
+Files: gradle*
+Copyright: 2015 the original author or authors.
+License: Apache-2.0
+
+# PGPainless Logo
+Files: assets/repository-open-graph.png
+Copyright: 2021 Paul Schaub <info@pgpainless.org>
+License: CC-BY-3.0
+
 Files: assets/test_vectors/*
 Copyright: 2018 Paul Schaub <info@pgpainless.org>
 License: CC0-1.0

assets/repository-open-graph.png.license

@@ -1,3 +0,0 @@
-SPDX-FileCopyrightText: 2021 Paul Schaub <info@pgpainless.org>
-
-SPDX-License-Identifier: CC-BY-3.0

gradle/wrapper/gradle-wrapper.jar.license

@@ -1,3 +0,0 @@
-SPDX-FileCopyrightText: 2021 The original Gradle authors
-
-SPDX-License-Identifier: Apache-2.0

gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,3 @@
-# SPDX-FileCopyrightText: 2021 The original Gradle authors
-#
-# SPDX-License-Identifier: Apache-2.0
-
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-6.4-rc-1-bin.zip

gradlew

@@ -1,9 +1,5 @@
 #!/usr/bin/env sh
 
-# Copyright 2015 the original author or authors.
-#
-# SPDX-License-Identifier: Apache-2.0
-
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X

gradlew.bat

@@ -1,5 +1,3 @@
-REM SPDX-License-Identifier: Apache-2.0
-
 @rem
 @rem Copyright 2015 the original author or authors.
 @rem