Backport Android cleanup parts from #7123 (#7513)

Also resync properly the dependencies versions.

Don't let the makefile handle the cleanups itself. Let gradle do it.

This is one of the first steps to remove the makefile and replace it with a full gradle support

build/android/build.gradle

@@ -9,6 +9,13 @@ buildscript {
 	}
 }
 
+def curl_version = "7.60.0"
+def gmp_version = "6.1.2"
+def irrlicht_revision = "5150"
+def openal_version = "1.18.2"
+def openssl_version = "1.0.2n"
+def sqlite3_version = "3240000"
+
 apply plugin: "com.android.application"
 
 android {
@@ -54,3 +61,64 @@ android {
 		}
 	}
 }
+
+task cleanAssets(type:Delete) {
+	delete 'src/main/assets'
+}
+
+task cleanIconv(type:Delete) {
+	delete 'deps/libiconv'
+}
+
+task cleanIrrlicht(type:Delete) {
+	delete 'deps/irrlicht'
+}
+
+task cleanLevelDB(type:Delete) {
+	delete 'deps/leveldb'
+}
+
+task cleanCURL(type:Delete) {
+	delete 'deps/curl'
+	delete 'deps/curl-' + curl_version
+}
+
+task cleanOpenSSL(type:Delete) {
+	delete 'deps/openssl'
+	delete 'deps/openssl-' + openssl_version
+	delete 'deps/openssl-' + openssl_version + '.tar.gz'
+}
+
+task cleanOpenAL(type:Delete) {
+	delete 'deps/openal-soft'
+}
+
+task cleanFreetype(type:Delete) {
+	delete 'deps/freetype2-android'
+}
+
+task cleanOgg(type:Delete) {
+	delete 'deps/libvorbis-libogg-android'
+}
+
+task cleanSQLite3(type:Delete) {
+	delete 'deps/sqlite-amalgamation-' + sqlite3_version
+	delete 'deps/sqlite-amalgamation-' + sqlite3_version + '.zip'
+}
+
+task cleanGMP(type:Delete) {
+	delete 'deps/gmp'
+	delete 'deps/gmp-' + gmp_version
+}
+
+task cleanAll(type:Delete, dependsOn:[clean,cleanAssets,cleanIconv,
+	cleanFreetype,cleanIrrlicht,cleanLevelDB,cleanSQLite3,cleanCURL,
+	cleanOpenSSL,cleanOpenAL,cleanOgg,cleanGMP]) {
+	delete 'deps'
+	delete 'gen'
+	delete 'libs'
+	delete 'obj'
+	delete 'bin'
+	delete 'Debug'
+	delete 'and_env'
+}