Support for Ubuntu 20.04

[saw235]

Was unable to build openroad in ubuntu 20.04 WSL
bazel build @org_theopenroadproject//:openroad
Was wondering if I'm missing something. Can anyone help?

rules_hdl_git_hash = "d2af0c7d03f89222f3004ece294cde51fe5c11ba"
rules_hdl_git_sha256 = "4e63172d3d98de8af91c7e8cf97c12ba8ca376217f63fdfbb52f0bc00256faf2"

Error log

In file included from external/org_theopenroadproject/src/odb/include/odb/dbId.h:35,
                 from external/org_theopenroadproject/src/odb/include/odb/dbViaParams.h:35,
                 from external/org_theopenroadproject/src/odb/include/odb/db.h:46,
                 from external/org_theopenroadproject/src/dpl/include/dpl/Opendp.h:51,
                 from external/org_theopenroadproject/src/dpl/src/OptMirror.cpp:35:
external/org_theopenroadproject/src/odb/include/odb/dbStream.h: In member function 'constexpr odb::dbOStream& odb::dbOStream::operator<<(const std::tuple<_Elements ...>&) const':
external/org_theopenroadproject/src/odb/include/odb/dbStream.h:197:14: error: binding reference of type 'odb::dbOStream&' to 'const odb::dbOStream' discards qualifiers
  197 |       return *this;
      |              ^~~~~

[QuantamHD]

Taking a look today