Use different method for getting ext_suffix

```
ext_suffix = get_config_var("EXT_SUFFIX") or get_config_var("SO")
```

because `get_config_var("SO")` returns None in Python 3.4.0a4 because the "SO"
variable is deprecated and "EXT_SUFFIX" is the new way to get this information
(see: http://bugs.python.org/issue19555)

This fixes `TypeError: Can't convert 'NoneType' object to str implicitly`
errors when running the tests on Python 3.4.0a4.

3 files changed, 6 insertions, 3 deletions

diff --git a/lib/Crypto/SelfTest/PublicKey/test_DSA.py b/lib/Crypto/SelfTest/PublicKey/test_DSA.py
index b05f69a..72b9e95 100644
--- a/lib/Crypto/SelfTest/PublicKey/test_DSA.py
+++ b/lib/Crypto/SelfTest/PublicKey/test_DSA.py
@@ -227,9 +227,10 @@ def get_tests(config={}):
     except ImportError:
         from distutils.sysconfig import get_config_var
         import inspect
+        ext_suffix = get_config_var("EXT_SUFFIX") or get_config_var("SO")
         _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
             inspect.getfile(inspect.currentframe())))
-            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
+            +"/../../PublicKey/_fastmath"+ext_suffix)
         if os.path.exists(_fm_path):
             raise ImportError("While the _fastmath module exists, importing "+
                 "it failed. This may point to the gmp or mpir shared library "+
diff --git a/lib/Crypto/SelfTest/PublicKey/test_RSA.py b/lib/Crypto/SelfTest/PublicKey/test_RSA.py
index 2884317..15f2a4f 100644
--- a/lib/Crypto/SelfTest/PublicKey/test_RSA.py
+++ b/lib/Crypto/SelfTest/PublicKey/test_RSA.py
@@ -463,9 +463,10 @@ def get_tests(config={}):
     except ImportError:
         from distutils.sysconfig import get_config_var
         import inspect
+        ext_suffix = get_config_var("EXT_SUFFIX") or get_config_var("SO")
         _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
             inspect.getfile(inspect.currentframe())))
-            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
+            +"/../../PublicKey/_fastmath"+ext_suffix)
         if os.path.exists(_fm_path):
             raise ImportError("While the _fastmath module exists, importing "+
                 "it failed. This may point to the gmp or mpir shared library "+
diff --git a/lib/Crypto/SelfTest/Util/test_number.py b/lib/Crypto/SelfTest/Util/test_number.py
index 2201a93..834607b 100644
--- a/lib/Crypto/SelfTest/Util/test_number.py
+++ b/lib/Crypto/SelfTest/Util/test_number.py
@@ -327,9 +327,10 @@ def get_tests(config={}):
     except ImportError:
         from distutils.sysconfig import get_config_var
         import inspect, os.path
+        ext_suffix = get_config_var("EXT_SUFFIX") or get_config_var("SO")
         _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
             inspect.getfile(inspect.currentframe())))
-            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
+            +"/../../PublicKey/_fastmath"+ext_suffix)
         if os.path.exists(_fm_path):
             raise ImportError("While the _fastmath module exists, importing "+
                 "it failed. This may point to the gmp or mpir shared library "+