crackxls: pull patch pending upstream inclusion for -fno-common toolchains
crackxls: pull patch pending upstream inclusion for -fno-common toolchains

Without the change build fails on upstream gcc-10 as:

  ld: decrypt.o:/build/crackxls2003/decrypt.c:50: multiple definition of
    `real_key'; crackxls2003.o:/build/crackxls2003/crackxls2003.c:64: first defined here

While at it dropped -O5 -march=native default optimization flags.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs