Apply findings from Android code inspect (lint). Update gradle. #10091

Job	Run time
build_test_headless_alpine	12m 29s
build-uwp	9m 4s
build-windows (x64)	10m 5s
build (ubuntu-latest, test, clang, clang++, ./b.sh --headless --unittest, clang-normal)	6m 53s
build-windows (ARM64)	9m 24s
build (ubuntu-latest, gcc, g++, ./b.sh --headless --unittest, gcc-normal)	5m 48s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a UNITTE...	9m 13s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=armeabi-v7a UNIT...	8m 33s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=x86_64 UNITTEST=...	9m 38s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a OPENXR...	4m 35s
build (ubuntu-latest, android, clang, clang++, ./b.sh --libretro_android ppsspp_libretro, android...	6m 42s
build (ubuntu-latest, qt, gcc, g++, ./b.sh --qt, qt)	6m 48s
build (ubuntu-latest, libretro, gcc, g++, make -C libretro -f Makefile -j2, gcc-libretro)	4m 34s
build (ubuntu-latest, libretro, clang, clang++, make -C libretro -f Makefile -j2, clang-libretro)	4m 47s
build (macos-latest, test, clang, clang++, ./b.sh --headless --unittest --fat --no-png --no-sdl2,...	8m 43s
build (macos-latest, ios, clang, clang++, ./b.sh --ios, ios)	5m 25s
test	0s
test-windows	40s
	2h 3m 21s

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