update for gnumeric
- Add gnumeric-CVE-2013-6836.patch: fix Heap-buffer-overflow in
ms_escher_get_data on a fuzzed xls file (bnc#856254, bgo#712772,
CVE-2013-6838).
- Submitted by Dominique Leuenberger (dimstar)
Fixed bugs
bnc#856254
CVE-2013-6836: gnumeric: gnumeric: heap-based buffer overflow in ms_escher_get_data function