android: clean debug and release assets

Change-Id: I3e6c53f6d82169ba5a529a63bae9256fb43d69ed
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/95332
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Tested-by: Jenkins
Reviewed-by: Henry Castro <hcastro@collabora.com>

android/.gitignore

@@ -1,5 +1,6 @@
 .gradle
 .idea
+/build
 /android.iml
 /build.gradle
 /local.properties
@@ -12,4 +13,6 @@
 /lib/src/main/assets/share/
 /lib/src/main/assets/unpack/
 /lib/src/main/assets/user/
+/lib/src/debug/assets
+/lib/src/release/assets
 /lib/src/main/cpp/lib

android/build.gradle.in

@@ -24,3 +24,7 @@ allprojects {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+afterEvaluate {
+    clean.dependsOn(':lib:clean')
+}

android/lib/build.gradle

@@ -291,6 +291,8 @@ ReferenceOOoMajorMinor=4.1
 
 clean.doFirst {
 	delete "src/main/assets"
+	delete "src/debug/assets"
+	delete "src/release/assets"
 }
 
 // creating the UI stuff is cheap, don't bother only applying it for the flavor..