Fix missing compile target

libsession/build.gradle

@@ -3,6 +3,10 @@ plugins {
     id 'kotlin-android'
 }
 
+android {
+    compileSdkVersion androidCompileSdkVersion
+}
+
 dependencies {
     implementation project(":libsignal")
     implementation "com.goterl.lazycode:lazysodium-android:4.2.0@aar"

libsession/src/main/AndroidManifest.xml

@@ -1,5 +1,2 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.session.libsession">
-
-</manifest>
+<manifest package="org.session.libsession" />