instdir/program/senddoc lacks executable mode bits

(but appears OK in "true" installation sets)

Change-Id: I1c044409b97bd3121509a2185dfac89298312954
(cherry picked from commit 46e63b70d99eab31758afd3abf29c2237b9248de)
Reviewed-on: https://gerrit.libreoffice.org/7967
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>