Merge pull request #144913 from trofi/fix-ansifilter-non-determinism

ansifilter: fix non-determinism in gzipped manpages with s/gzip/gzip -n/

pkgs/tools/text/ansifilter/default.nix

···
 
   postPatch = ''
     substituteInPlace src/makefile --replace "CC=g++" "CC=c++"
+    # avoid timestamp non-determinism with '-n'
+    substituteInPlace makefile --replace 'gzip -9f' 'gzip -9nf'
   '';
 
   makeFlags = [