waf: sanitize and fix added cross answer
When configuring samba for cross-compilation using the cross-answers
method, the function add_answer receives the standard output and exit code
of a configuration test and updates the cross-answers file accordingly.
This patch sanitizes the standard output to conform to the cross-answers
file format - one line of output. It also adds a missing newline.
(Note - at this point add_answer is only ever called with empty output
but this change is significant for the reminder of this patchset)
Signed-off-by: Uri Simchoni <urisimchoni@gmail.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>