common: Allow a second input stream for gnupg_exec_tool_stream.
* common/exechelp-posix.c (do_exec): Add arg 'except' and pass to close_all_fds. (gnupg_spawn_process): Add arg 'except'. Change callers to pass NULL for it. * common/exechelp-w32.c (gnupg_spawn_process): Add dummy arg 'except'. * common/exechelp-w32ce.c (gnupg_spawn_process): Ditto. * common/exectool.c (copy_buffer_do_copy): Allow NULL for SINK. (gnupg_exec_tool_stream): Add arg 'inextra'. Change callers to pass NULL for it. Allow NULL for OUTPUT.
This hack is a first step to allow calling gpg for verification of
signatures.
- Signed-off-by: Werner Koch <wk@gnupg.org>