[Pixman] Detection of CPU features, on Android / ARM

[Sylvain Becker]

Hello,

For Android / ARM, detection of CPU features is done by
"detect_cpu_features()" in the file "pixman-arm.c".
It relies on Android NDK functions and only checks for
ANDROID_CPU_FAMILY_ARM.
Whereas, it exists also ANDROID_CPU_FAMILY_ARM64 for ABI arm64-v8a (
https://developer.android.com/ndk/guides/cpu-features.html#functions ).
Which means NEON implementation is not activated for this ABI.

Cheers,
Sylvain
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