netpbm: Remove "CVE" patch

The CVE was patched upstream long ago.

http://cve.circl.lu/cve/CVE-2005-2471

-dPARANOIDSAFER seems not to be supported any more.

https://phabricator.wikimedia.org/T136402#2338482
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=79a06b45e784e6839b2b2129cd2620ea606254e1

pkgs/tools/graphics/netpbm/default.nix

@@ -28,10 +28,6 @@ stdenv.mkDerivation {
   };
 
   postPatch = ''
-    # CVE-2005-2471, from Arch
-    substituteInPlace converter/other/pstopnm.c \
-      --replace '"-dSAFER"' '"-dPARANOIDSAFER"'
-
     # Install libnetpbm.so symlink to correct destination
     substituteInPlace lib/Makefile \
       --replace '/sharedlink' '/lib'