IWYU: Android files including jni.h

generated in an Android build directory using
  git grep "<jni.h>" | awk -F ":" '{print $1'} | xargs tools_webrtc/iwyu/apply-include-cleaner
followed by manually including
  native_api/jni/jvm.h
for webrtc::AttachCurrentThreadIfNeeded() where needed and small fixes
to make things compile again.

Bug: webrtc:42226242
Change-Id: I562b3bda007611f187aab14a838865f91a138e60
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/396287
Reviewed-by: Zoé Lepaul <xalep@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@meta.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44984}