dirmngr: Let Libassuan employ nPth wrappers for connect.
* dirmngr/http.c (my_unprotect, my_protect): Remove. (connect_server): Do not use these wrappers.
Since Libassuan version 2.4.2 the macro ASSUAN_SYSTEM_NPTH_IMPL
protects the low-level connect calls with npth_unprotect and
npth_protect. This is better than the high-level kludge we used here.
- Signed-off-by: Werner Koch <wk@gnupg.org>