rocmPackages.llvm.flang: mark broken due to error

pkgs/development/rocm-modules/5/llvm/stage-3/flang.nix

···
     "-DCLANG_TABLEGEN_EXE=${clang-unwrapped}/bin/clang-tblgen"
     "-DFLANG_INCLUDE_TESTS=OFF" # `The dependency target "Bye" of target ...`
   ];
+
+  # `flang/lib/Semantics/check-omp-structure.cpp:1905:1: error: no member named 'v' in 'Fortran::parser::OmpClause::OmpxDynCgroupMem'`
+  isBroken = true;
 }