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

Test case: http://jutaky.com/fuzzing/gnumeric_case_18292_19947.2xls.gnumeric

$ ssconvert gnumeric_case_18292_19947.2xls.gnumeric /tmp/out.xls

==24451==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f1b97f3b20a sp 0x7ffda7b8a658 bp 0x7ffda7b8a690 T0)
    #0 0x7f1b97f3b209 in __GI_strlen (/usr/lib/libc.so.6+0x80209)
    #1 0x7f1ba02749d5 in strlen (/usr/lib/libasan.so.1+0x339d5)
    #2 0x7f1b79fa94f1 in txomarkup_new gnumeric/gnumeric/plugins/excel/ms-excel-write.c:2788
    #3 0x7f1b79fd2a53 in extract_txomarkup gnumeric/gnumeric/plugins/excel/ms-excel-write.c:6666
    #4 0x7f1b79fd3821 in excel_write_state_new gnumeric/gnumeric/plugins/excel/ms-excel-write.c:6757
    #5 0x7f1b79f2c004 in excel_save gnumeric/gnumeric/plugins/excel/boot.c:289
    #6 0x7f1b79f2c6fb in excel_biff8_file_save gnumeric/gnumeric/plugins/excel/boot.c:350
    #7 0x7f1b9e8c00f8 in go_plugin_loader_module_func_file_save app/go-plugin-loader-module.c:366
    #8 0x7f1b9e8c750a in go_plugin_file_saver_save app/go-plugin-service.c:948
    #9 0x7f1b9e8d03ec in go_file_saver_save app/file.c:848
    #10 0x7f1b9f7aa291 in wbv_save_to_output gnumeric/gnumeric/src/workbook-view.c:1059
    #11 0x7f1b9f7aa74b in wb_view_save_to_uri gnumeric/gnumeric/src/workbook-view.c:1093
    #12 0x7f1b9f7aacbd in wb_view_save_as gnumeric/gnumeric/src/workbook-view.c:1129
    #13 0x408c24 in convert gnumeric/gnumeric/src/ssconvert.c:831
    #14 0x409439 in main gnumeric/gnumeric/src/ssconvert.c:903
    #15 0x7f1b97edb7ff in __libc_start_main (/usr/lib/libc.so.6+0x207ff)
    #16 0x4040f8 in _start (apps/bin/ssconvert+0x4040f8)

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Juha Kylmänen