when running make rhinojs fails due to a missing cp command

cp rhino/buildGradle/libs/rhino*.jar rhino.jar
usage: cp [-R [-H | -L | -P]] [-fi | -n] [-apvXc] source_file target_file
       cp [-R [-H | -L | -P]] [-fi | -n] [-apvXc] source_file ... target_directory
make: *** [rhino.jar] Error 64

Issue was resolved by manually copying one of the jars

`cp rhino/buildGradle/libs/r

Issue details

Tooltips broken on Android. They do not show but cause an exception instead.
Also referenced in #4921

Reproduction steps/code

Run the UITest on android (i used a Huawei P8, Android 5)

Version of LibGDX and/or relevant dependencies

1.9.6

Stacktrace

10-12 18:23:17.610 571-761/com.badlogic.gdx.tests.android W/System.err: java.lang.NullPointerE

Not a single form field has a label. These designs are not usable and the patterns presented should be discouraged.

I suggest adding a validation check like Nu Validator, aXe, lighthouse, etc. to show all the places this markup is invalid.