remove unused pkcs7 bindings

Author: alex

src/_cffi_src/openssl/pkcs7.py

@@ -42,18 +42,7 @@
     ...;
 } PKCS7;
 
-static const int PKCS7_BINARY;
-static const int PKCS7_DETACHED;
-static const int PKCS7_NOATTR;
-static const int PKCS7_NOCERTS;
-static const int PKCS7_NOCHAIN;
-static const int PKCS7_NOINTERN;
-static const int PKCS7_NOSIGS;
-static const int PKCS7_NOSMIMECAP;
-static const int PKCS7_NOVERIFY;
-static const int PKCS7_STREAM;
 static const int PKCS7_TEXT;
-static const int PKCS7_PARTIAL;
 """
 
 FUNCTIONS = """