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Bionic gained log2 and log2f in Android 4.3, API level 18. Devices below that are under 0.1 percent of the installed base, Google Play services dropped them in 2021 and no NDK newer than r24 can target them. VLC 3 however still ships Android 4.2 builds with NDK 21 against current FFmpeg releases, so provide the two functions for that case rather than keeping generic fallbacks for the whole libm. Signed-off-by: Kacper Michajłow <kasper93@gmail.com>