oneDNN: disable tests to avoid illegal instructions

oneDNN tests fail on some Hydra builders because they do not support SSE
4.2. Unfortunately, oneDNN does not seem to work without SSE 4.2, see
issues NixOS#93692 and NixOS#93747.

pkgs/development/libraries/oneDNN/default.nix

@@ -18,21 +18,13 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  doCheck = true;
-
-  cmakeFlags = [
-    # oneDNN compiles with -msse4.1 by default, but not all x86_64
-    # CPUs support SSE 4.1.
-    "-DDNNL_ARCH_OPT_FLAGS="
-  ];
+  # Tests fail on some Hydra builders, because they do not support SSE4.2.
+  doCheck = false;
 
   # The test driver doesn't add an RPath to the build libdir
   preCheck = ''
     export LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}$PWD/src
     export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH''${DYLD_LIBRARY_PATH:+:}$PWD/src
-  '' + lib.optionalString stdenv.isx86_64 ''
-    # Use baseline SIMD in case CPU features get misdetected.
-    export DNNL_MAX_CPU_ISA=SSE41
   '';
 
   # The cmake install gets tripped up and installs a nix tree into $out, in