openroad: unpin Boost

Doesn’t fully build for me due to the tests mentioned in
<#369735 (comment)>,
but gets past all the C++ compilation and fails on the same tests
as without this change, so this seeems safe to get rid of the sole
remaining user of Boost 1.80. Upstream pins no specific version in
their build system (though their Dockerfile installs the version from
CentOS 7, which is the truly ancient Boost 1.53).

Author: emilazy

pkgs/applications/science/electronics/openroad/default.nix

@@ -9,7 +9,7 @@
   git,
   python3,
   swig,
-  boost180,
+  boost,
   cbc, # for clp
   cimg,
   clp, # for or-tools
@@ -70,7 +70,7 @@ mkDerivation rec {
   ];
 
   buildInputs = [
-    boost180
+    boost
     cbc
     cimg
     clp