Use general hardening flag toggle lists

The following parameters are now available:

  * hardeningDisable
    To disable specific hardening flags
  * hardeningEnable
    To enable specific hardening flags

Only the cc-wrapper supports this right now, but these may be reused by
other wrappers, builders or setup hooks.

cc-wrapper supports the following flags:

  * fortify
  * stackprotector
  * pie (disabled by default)
  * pic
  * strictoverflow
  * format
  * relro
  * bindnow

pkgs/tools/system/cron/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation {
 
   unpackCmd = "(mkdir cron && cd cron && sh $curSrc)";
 
-  hardening_pie = true;
+  hardeningEnable = [ "pie" ];
 
   preBuild = ''
     substituteInPlace Makefile --replace ' -o root' ' ' --replace 111 755

pkgs/tools/system/foremost/default.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   preInstall = ''
     mkdir -p $out/{bin,share/man/man8}

pkgs/tools/system/gdmap/default.nix

@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   patches = [ ./get_sensitive.patch ./set_flags.patch ];
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   meta = with stdenv.lib; {
     homepage = http://gdmap.sourceforge.net;

pkgs/tools/system/rsyslog/default.nix

@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
     rabbitmq-c hiredis
   ] ++ stdenv.lib.optional stdenv.isLinux systemd;
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   configureFlags = [
     "--sysconfdir=/etc"

pkgs/tools/system/which/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
   };
 
   # FIXME needs gcc 4.9 in bootstrap tools
-  hardening_stackprotector = false;
+  hardeningDisable = [ "stackprotector" ];
 
   meta = with stdenv.lib; {
     homepage = http://ftp.gnu.org/gnu/which/;