SkQP: optionally build make_universal_apk with debug on.

  * Respects SKQP_DEBUG=true.
  * Also, be more selective about cleaning. (So I can test on master.)
  * Also, stop using `gradlew --daemon`, which was getting confused
    when switching back and forth build types.

No-Try:true
Change-Id: Id93f77ab7831a82cad9a3a64dbb8a93af4757d57
Reviewed-on: https://skia-review.googlesource.com/108222
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Stephan Altmueller <stephana@google.com>
1 file changed