bnc#882595: Process VBA blobs before formula cells.

So that formula cells with user-defined functions will be interpreted
correctly.

Change-Id: I49c10109575f9f82d7f85dea63590bf02b70e041
(cherry picked from commit 5e83804da815a982aed567a8cae4cc078491dcbd)
Reviewed-on: https://gerrit.libreoffice.org/9912
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>