remove attempts to test against openssl 0.9.8 (#484)

* remove attempts to test against openssl 0.9.8

* remove some untested branches
diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py
index c0fbc1d..4e0f8a4 100644
--- a/src/OpenSSL/SSL.py
+++ b/src/OpenSSL/SSL.py
@@ -59,10 +59,7 @@
 OP_NO_TLSv1_1 = getattr(_lib, "SSL_OP_NO_TLSv1_1", 0)
 OP_NO_TLSv1_2 = getattr(_lib, "SSL_OP_NO_TLSv1_2", 0)
 
-try:
-    MODE_RELEASE_BUFFERS = _lib.SSL_MODE_RELEASE_BUFFERS
-except AttributeError:
-    pass
+MODE_RELEASE_BUFFERS = _lib.SSL_MODE_RELEASE_BUFFERS
 
 OP_SINGLE_DH_USE = _lib.SSL_OP_SINGLE_DH_USE
 OP_SINGLE_ECDH_USE = _lib.SSL_OP_SINGLE_ECDH_USE
@@ -90,10 +87,7 @@
 OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG = (
     _lib.SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
 )
-try:
-    OP_NO_COMPRESSION = _lib.SSL_OP_NO_COMPRESSION
-except AttributeError:
-    pass
+OP_NO_COMPRESSION = _lib.SSL_OP_NO_COMPRESSION
 
 OP_NO_QUERY_MTU = _lib.SSL_OP_NO_QUERY_MTU
 OP_COOKIE_EXCHANGE = _lib.SSL_OP_COOKIE_EXCHANGE