dmd: disable whitespace-sensitive tests for binutils-2.39

Without the change two tests fail on `binutils-2.39` due to whitespace
change in `objdump` output as:

    FAILED targets:
    - runnable/cdvecfill.sh
    - compilable/cdcmp.d

Let's disable the tests until they are fixed upstream:
    https://issues.dlang.org/show_bug.cgi?id=23317

pkgs/development/compilers/dmd/default.nix

@@ -84,6 +84,11 @@ stdenv.mkDerivation rec {
   postPatch =
   ''
     patchShebangs .
+
+    # Disable tests that rely on objdump whitespace until fixed upstream:
+    #   https://issues.dlang.org/show_bug.cgi?id=23317
+    rm dmd/test/runnable/cdvecfill.sh
+    rm dmd/test/compilable/cdcmp.d
   ''
 
   # This one has tested against a hardcoded year, then against a current year on