Revert "shell.nix: Add libseccomp"
Revert "shell.nix: Add libseccomp"

This reverts commit 1df82b62456b3194b3d8be0562e886cf16bf9379.

bennofs/nix,layus/nix,bennofs/nix,dtzWill/nix,shlevy/nix,peti/nix,NixOS/nix,rycee/nix,peti/nix,shlevy/nix,zimbatm/nix,rycee/nix,NixOS/nix,dezgeg/nix,peti/nix,peti/nix,ehmry/nix,rycee/nix,layus/nix,vcunat/nix,pikajude/nix,bennofs/nix,ehmry/nix,dtzWill/nix,bennofs/nix,rycee/nix,zimbatm/nix,pikajude/nix,dezgeg/nix,ehmry/nix,peti/nix,dtzWill/nix,dezgeg/nix,dezgeg/nix,shlevy/nix,NixOS/nix,rycee/nix,dtzWill/nix,zimbatm/nix,ehmry/nix,zimbatm/nix,vcunat/nix,pikajude/nix,vcunat/nix,ehmry/nix,dezgeg/nix,NixOS/nix,layus/nix,dtzWill/nix,ehmry/nix,shlevy/nix,layus/nix,vcunat/nix,NixOS/nix,shlevy/nix,layus/nix