Disable audio before Android 11

The permission "android.permission.RECORD_AUDIO" has been added for
shell in Android 11.

Moreover, on lower versions, it may make the server segfault on the
device (happened on a Nexus 5 with Android 6.0.1).

Refs <https://android.googlesource.com/platform/frameworks/base/+/4feeee88911503cc365b223a712437abcd91c94f%5E%21/>
PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>