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/development/libraries/opencascade/6.5.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
   # https://bugs.freedesktop.org/show_bug.cgi?id=83631
     + " -DGLX_GLXEXT_LEGACY";
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   configureFlags = [ "--with-tcl=${tcl}/lib" "--with-tk=${tk}/lib" "--with-qt=${qt4}" "--with-ftgl=${ftgl}" "--with-freetype=${freetype}" ];
 

pkgs/development/libraries/opencascade/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   # https://bugs.freedesktop.org/show_bug.cgi?id=83631
   NIX_CFLAGS_COMPILE = "-DGLX_GLXEXT_LEGACY";
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   postInstall = ''
     mv $out/inc $out/include