Fixes after review

custom-dependencies/android-sdk/build.gradle.kts

@@ -97,7 +97,6 @@ val extractAndroidJar by tasks.creating {
     inputs.files(androidPlatform)
     val targetFile = File(libsDestDir, "android.jar")
     outputs.files(targetFile)
-    outputs.upToDateWhen { targetFile.exists() } // TODO: consider more precise check, e.g. hash-based
     doFirst {
         project.copy {
             from(zipTree(androidPlatform.singleFile).matching { include("**/android.jar") }.files.first())

custom-dependencies/protobuf-lite/build.gradle.kts

@@ -21,10 +21,7 @@ dependencies {
 }
 
 task("prepare") {
-    // TODO: find out why it doesn't work without explicit dependsOn
-    dependsOn(":custom-dependencies:protobuf-relocated:prepare")
-    val inputJar = relocatedProtobuf.files.single()
-    inputs.files(inputJar)
+    inputs.files(relocatedProtobuf) // this also adds a dependency
     outputs.file(outputJarPath)
     doFirst {
         File(outputJarPath).parentFile.mkdirs()
@@ -49,7 +46,7 @@ task("prepare") {
             return result
         }
 
-        val allFiles = loadAllFromJar(File(inputJar))
+        val allFiles = loadAllFromJar(File(relocatedProtobuf.singleFile))
 
         val keepClasses = arrayListOf<String>()