* plugins/excel/ms-excel-read.c (excel_formula_shared): Simplify using
g_memdup.  (excel_read_IMDATA): Initialize variables.

* plugins/excel/ms-escher.c (ms_escher_blip_new,
ms_escher_read_ClientAnchor): Ditto.

* plugins/excel/crypt-md4.c: Include crypt-md4.h and make signatures
consistent with it.

* plugins/excel/crypt-md4.h: Add include guards.

* src/sheet-object-image.c (sheet_object_image_new): Simplify
using g_memdup.
(sheet_object_image_print): fix up types to make gmorten happy.