Fix compatibility with M2Crypto>=0.26.0

--- browserid/crypto/_m2_monkeypatch.py.orig	2014-12-12 06:15:36.000000000 +0100
+++ browserid/crypto/_m2_monkeypatch.py	2018-10-12 18:29:19.859395622 +0200
@@ -8,9 +8,9 @@
 #  We use ctypes to avoid recompiling the M2Crypto binaries.
 
 import ctypes
-from M2Crypto import RSA, DSA, m2, __m2crypto
+from M2Crypto import RSA, DSA, m2, _m2crypto
 
-_m2lib = ctypes.CDLL(__m2crypto.__file__)
+_m2lib = ctypes.CDLL(_m2crypto.__file__)
 
 
 _m2lib.BN_free.argtypes = (ctypes.c_void_p,)
@@ -109,9 +109,7 @@
 def load_pub_key_params(p, q, g, pub):
     """Create a DSA_pub object from parameters and key."""
     dsa = m2.dsa_new()
-    m2.dsa_set_p(dsa, p)
-    m2.dsa_set_q(dsa, q)
-    m2.dsa_set_g(dsa, g)
+    m2.dsa_set_pqg(dsa, p, q, g)
     m2.dsa_set_pub(dsa, pub)
     return DSA.DSA_pub(dsa, 1)
 
@@ -120,9 +118,7 @@
 def load_key_params(p, q, g, pub, priv):
     """Create a DSA object from parameters and key."""
     dsa = m2.dsa_new()
-    m2.dsa_set_p(dsa, p)
-    m2.dsa_set_q(dsa, q)
-    m2.dsa_set_g(dsa, g)
+    m2.dsa_set_pqg(dsa, p, q, g)
     m2.dsa_set_pub(dsa, pub)
     m2.dsa_set_priv(dsa, priv)
     return DSA.DSA(dsa, 1)