Merge pull request #188 from mckaygerhard/patch-1

backguard compat for openssl on providers, like LTS linuxes

src/x509.c

@@ -655,6 +655,7 @@ static int meth_set_encode(lua_State* L)
   return 1;
 }
 
+#if (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
 /**
  * Get signature name.
  */
@@ -669,6 +670,7 @@ static int meth_get_signature_name(lua_State* L)
     lua_pushstring(L, name);
   return 1;
 }
+#endif
 
 /*---------------------------------------------------------------------------*/
 
@@ -698,7 +700,9 @@ static luaL_Reg methods[] = {
   {"digest",     meth_digest},
   {"setencode",  meth_set_encode},
   {"extensions", meth_extensions},
+#if (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
   {"getsignaturename", meth_get_signature_name},
+#endif
   {"issuer",     meth_issuer},
   {"notbefore",  meth_notbefore},
   {"notafter",   meth_notafter},