Warn about -mavx compile option

[ThwyIgo]

In the Makefile, gcc is used with the -mavx flag, which allows it to use some instructions that are available only to some specific CPUs.
If the CPU doesn't support the instructions, make run will fail with the following unhelpful and confusing error message:

Makefile:21: recipe for target 'run' failed
make: *** [run] Error -1073741795

Possible solutions:

Just remove -mavx from the Makefile.
OR...
Warn the users that their CPU should support the AVX instruction set, and provide instructions to compile without AVX if it's not supported.

Info about the environment

OS: Windows 10 (native, without WSL)
Compiler: GCC

I speak portuguese if anything wasn't clear.

[ThwyIgo]

I've seen you were using -march=native before and had problems with it.
It should be a compile option that never fails, what kind of problems were you having with it?