common: Make use of default_errsource in exechelp.
* common/exechelp-posix.c (my_error_from_syserror, my_error): New. Use them instead of gpg_error and gpg_error_from_syserror. (create_pipe_and_estream): Remove arg ERRSOURCE and fix use of OUTBOUND which has a wrong name. Adjust callers. (gnupg_spawn_process): Remove arg ERRSOURCE and replace by use of DEFAULT_ERRSOURCE. * common/exechelp-w32.c (gnupg_spawn_process): Ditto. * common/exechelp-w32ce.c (gnupg_spawn_process): Ditto. * common/exectool.c (gnupg_exec_tool_stream): Do not pass GPG_ERROR_FROM_SYSERROR. * tools/gpgconf-comp.c (gc_component_check_options): Ditto. (retrieve_options_from_program): Ditto.
- Signed-off-by: Werner Koch <wk@gnupg.org>