buildPythonPackage: get rid of setupPyInstallFlags since there is no such thing

pkgs/development/python-modules/generic/default.nix

@@ -95,7 +95,7 @@ python.stdenv.mkDerivation (builtins.removeAttrs attrs ["disabled"] // {
     export PYTHONPATH="$out/${python.sitePackages}:$PYTHONPATH"
 
     pushd dist
-    ${bootstrapped-pip}/bin/pip install *.whl --no-index --prefix=$out
+    ${bootstrapped-pip}/bin/pip install *.whl --no-index --prefix=$out --no-cache
     popd
 
     runHook postInstall

pkgs/development/python-modules/tables/default.nix

@@ -20,7 +20,6 @@ buildPythonPackage rec {
       "--lzo=${lzo}"
       "--bzip2=${bzip2}"
     ];
-  setupPyInstallFlags = setupPyBuildFlags;
 
   # Run the test suite.
   # It requires the build path to be in the python search path.