Bug#851497: hashcat builds with -march=native

[Adrian Bunk]

Source: hashcat
Version: 3.20-1
Severity: grave

src/Makefile sets -march=native

This means the code will only run on machines with a CPU
compatible with the one on the machine where the package
was built.

Building on a different buildd machine can also change
where the code can run - including breaking existing
setups in stable updates.

Please remove -march=native from src/Makefile