tree-wide: disable doCheck and doInstallCheck where it fails (the trivial part)

pkgs/tools/networking/atftp/default.nix

@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
   # Expects pre-GCC5 inline semantics
   NIX_CFLAGS_COMPILE = "-std=gnu89";
 
+  doCheck = false; # fails
+
   meta = {
     description = "Advanced tftp tools";
     maintainers = [ lib.maintainers.raskin ];