python3Packages.pyvex: fix cross (#354109)

Changed files
+5
pkgs
development
python-modules
pyvex
+5
pkgs/development/python-modules/pyvex/default.nix
···
stdenv,
bitstring,
buildPythonPackage,
+
buildPackages,
cffi,
fetchPypi,
pycparser,
···
cffi
pycparser
];
+
+
depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+
nativeBuildInputs = [ cffi ];
postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
substituteInPlace vex/Makefile-gcc \