Patch to make host build work without gnutls.

--- a/cmake/mariadb_connector_c.cmake
+++ b/cmake/mariadb_connector_c.cmake
@@ -18,7 +18,7 @@ IF(NOT CONC_WITH_SSL)
     IF(WIN32)
       SET(CONC_WITH_SSL "SCHANNEL")
     ELSE()
-      SET(CONC_WITH_SSL "GNUTLS") # that's what debian wants, right?
+      SET(CONC_WITH_SSL "OPENSSL")
     ENDIF()
   ELSE()
     SET(CONC_WITH_SSL "OPENSSL")
