Fiddle with hard-coded neon config.h to support USE_NONBLOCKING_CONNECT
Fiddle with hard-coded neon config.h to support USE_NONBLOCKING_CONNECT

...see the condition in neon's src/neon_socket.c under which
USE_NONBLOCKING_CONNECT would be enabled.  This should not have any immediate
effect in LibreOffice, as we do not call ne_set_connect_timeout.  But it might
be beneficial to selectively do so in light of rhbz#915743 "thread
deadlock/slow join in insert->hyperlink in impress," to work around neon's
disability to abort potentially blocking calls.

The enabled features are hopefully POSIX-y enough to allow for plain #ifdef UNX.
If not, we need to adapt this to more fine grained conditions.

Change-Id: I6bf0a89c1ae73d7183f515e780fff7fe0ae2fed0
Reviewed-on: https://gerrit.libreoffice.org/2492
Tested-by: LibreOffice gerrit bot <3b97070d46ccd66422a8e7b83e6967ed84780538@libreoffice.org>
Reviewed-by: Stephan Bergmann <05c31e1673f7a15a4f0f5429fb1e32d6e84bebe3@redhat.com>
Tested-by: Stephan Bergmann <05c31e1673f7a15a4f0f5429fb1e32d6e84bebe3@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core