cmake: only need cpu-feature.c from ndk on 32-bit ARM and when getauxval is unavailable

[madebr]

It is used in src/cpuinfo/SDL_cpuinfo.c:

SDL/src/cpuinfo/SDL_cpuinfo.c

Lines 79 to 81 in 7073cfc

	#if defined(SDL_PLATFORM_ANDROID) && defined(__arm__) && !defined(HAVE_GETAUXVAL)
	#include <cpu-features.h>
	#endif

Description

Existing Issue(s)

[madebr]

This PR does not change the behavior of SDL3.

But if we pull in cpu-feature conditionally, doesn't that mean older Android that does not have getauxval will fail to start?
Does SDL even support Android versions this old?

[rollerozxa]

But if we pull in cpu-feature conditionally, doesn't that mean older Android that does not have getauxval will fail to start?
Does SDL even support Android versions this old?

getauxval was added to bionic in January of 2013 (commit) which would mean it was added in... Android 4.3 (released July 2013), let's say? Which is further back than the current minimum Android version that SDL supports (5.0).

[slouken]

Does that mean we can just drop it at this point?

[madebr]

getauxval is in bionic of android-5.0.0r1.
So I think it is safe to drop it completely.