Box2D not building on armeabi-v7a

[bostick]

I am using Box2D for an Android project and with the latest commit on main branch (b864f53), I get an error when building on armeabi-v7a.

/Users/brenton/development/github/raylib-experiment/raymob/app/.cxx/Debug/q5f4v4e5/armeabi-v7a/_deps/box2d-src/src/contact_solver.c:670:9: error: call to undeclared function 'vzip1q_f32'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        return vzip1q_f32( a, b );
               ^
/Users/brenton/development/github/raylib-experiment/raymob/app/.cxx/Debug/q5f4v4e5/armeabi-v7a/_deps/box2d-src/src/contact_solver.c:670:9: note: did you mean 'vzipq_f32'?
/Users/brenton/Library/Android/sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/darwin-x86_64/lib/clang/17/include/arm_neon.h:32079:20: note: 'vzipq_f32' declared here
__ai float32x4x2_t vzipq_f32(float32x4_t __p0, float32x4_t __p1) {
                   ^

vzip1q_f32 is A64 and not available on armeabi-v7a.

armeabi-v7a is a supported ABI:
https://developer.android.com/ndk/guides/abis

But this is not specific to Android, but this is the easiest way to demonstrate the problem.

[erincatto]

I applied your Neon patches in #817. Thanks for the fix!