Git versions of gtk, glib, goffice, gnumeric, libgsf and libxml2.

Test case: http://jutaky.com/fuzzing/gnumeric_case_015-ms-chart.c.3083.xls

$ ssconvert gnumeric_case_015-ms-chart.c.3083.xls /tmp/out.gnumeric

==5538==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f176b09df1c bp 0x7ffd32109a10 sp 0x7ffd32109860 T0)
    #0 0x7f176b09df1b in xl_chart_read_end gnumeric/gnumeric/plugins/excel/ms-chart.c:3083:28
    #1 0x7f176b07b96a in ms_excel_chart_read gnumeric/gnumeric/plugins/excel/ms-chart.c:3819:12
    #2 0x7f176afee35d in excel_read_sheet gnumeric/gnumeric/plugins/excel/ms-excel-read.c:6912:4
    #3 0x7f176afdfa4d in excel_read_BOF gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7143:4
    #4 0x7f176afd4840 in excel_read_workbook gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7234:3
    #5 0x7f176afaff21 in excel_enc_file_open gnumeric/gnumeric/plugins/excel/boot.c:170:4
    #6 0x7f177fec8ca2 in go_plugin_loader_module_func_file_open gnumeric/goffice/goffice/app/go-plugin-loader-module.c:282:3
    #7 0x7f177fed1966 in go_plugin_file_opener_open gnumeric/goffice/goffice/app/go-plugin-service.c:685:2
    #8 0x7f177fed5abc in go_file_opener_open gnumeric/goffice/goffice/app/file.c:417:2
    #9 0x7f1780adb910 in workbook_view_new_from_input gnumeric/gnumeric/src/workbook-view.c:1278:3
    #10 0x7f1780adbc8f in workbook_view_new_from_uri gnumeric/gnumeric/src/workbook-view.c:1337:9
    #11 0x4dd2d5 in convert gnumeric/gnumeric/src/ssconvert.c:715:9
    #12 0x4dc712 in main gnumeric/gnumeric/src/ssconvert.c:918:19
    #13 0x7f177a87b60f in __libc_start_main (/usr/lib/libc.so.6+0x2060f)
    #14 0x41a6a8 in _start (apps/bin/ssconvert+0x41a6a8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV gnumeric/gnumeric/plugins/excel/ms-chart.c:3083:28 in xl_chart_read_end

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Juha Kylmänen