Drop support for cffi 0.x

setup.py

@@ -45,20 +45,9 @@
 import sys
 import unittest
 
-# Get cffi major version
-try:
-    import cffi
-except ImportError:
-    cffi_major_version = None
-else:
-    cffi_major_version = cffi.__version_info__[0]
-
 # Import stuff from pygit2/_utils.py without loading the whole pygit2 package
 sys.path.insert(0, 'pygit2')
 from _build import __version__, get_libgit2_paths
-if cffi_major_version == 0:
-    from _run import ffi, preamble, C_KEYWORDS
-    ffi.verify(preamble, **C_KEYWORDS)
 del sys.path[0]
 
 
@@ -169,6 +158,7 @@ def run(self):
     cmdclass['build'] = BuildWithDLLs
 
 extra_args = {
+    'cffi_modules': ['pygit2/_run.py:ffi'],
     'ext_modules': [
         Extension('_pygit2', pygit2_exts, libraries=['git2'],
                   include_dirs=[libgit2_include],
@@ -177,12 +167,6 @@ def run(self):
     ],
 }
 
-if cffi_major_version == 0:
-    extra_args['ext_modules'].append(ffi.verifier.get_extension())
-else:
-    extra_args['cffi_modules'] = ['pygit2/_run.py:ffi']
-
-
 setup(name='pygit2',
       description='Python bindings for libgit2.',
       keywords='git',
@@ -195,7 +179,6 @@ def run(self):
       long_description=long_description,
       packages=['pygit2'],
       package_data={'pygit2': ['decl.h']},
-      setup_requires=['cffi'],
       install_requires=['cffi', 'six'],
       zip_safe=False,
       cmdclass=cmdclass,