Implement runtime check for AVX2 SIMD functionality in collisions #203
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This PR implements a runtime check on whether the AVX2 instruction set is present or not in the CPU. Compile-time macros like
__AVX2__only flags whether the compiler support generating code using AVX2, but not whether the running system would be able to execute it. If a non-AVX2-supporting processor runs an AVX2-using code, the program will generate a segfault over an unrecognized instruction/opcode, as what I intend to fix #202. Because pygame-geometry doesn't use SDL2, which means not being able to use the straightforwardSDL_HasAVX2function, I had to make my own function to check it.