bloaty: update path to c++filt after #29396

pkgs/development/tools/bloaty/default.nix

···
   preConfigure = ''
     substituteInPlace src/bloaty.cc \
       --replace "c++filt" \
-                "${stdenv.lib.getBin binutils}/bin/c++filt"
+                "${binutils.bintools}/bin/c++filt"
   '';
 
   doCheck = true;