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

Test case: http://jutaky.com/fuzzing/gnumeric_case_001-ms-excel-read.c.964.xls

$ ssconvert gnumeric_case_001-ms-excel-read.c.964.xls /tmp/out.gnumeric

==13910==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000001 (pc 0x7f18548bf9f2 bp 0x7ffd432a1630 sp 0x7ffd432a1260 T0)
    #0 0x7f18548bf9f1 in excel_read_string_header gnumeric/gnumeric/plugins/excel/ms-excel-read.c:964:11
    #1 0x7f1854928208 in sst_read_string gnumeric/gnumeric/plugins/excel/ms-excel-read.c:1246:13
    #2 0x7f1854919ca6 in excel_read_SST gnumeric/gnumeric/plugins/excel/ms-excel-read.c:1334:12
    #3 0x7f18548db50a in excel_read_workbook gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7334:21
    #4 0x7f185484ec97 in excel_enc_file_open gnumeric/gnumeric/plugins/excel/boot.c:170:4
    #5 0x7f18548507a4 in excel_file_open gnumeric/gnumeric/plugins/excel/boot.c:273:2
    #6 0x7f187aa01333 in go_plugin_loader_module_func_file_open gnumeric/goffice/goffice/app/go-plugin-loader-module.c:282:3
    #7 0x7f187aa1ad3f in go_plugin_file_opener_open gnumeric/goffice/goffice/app/go-plugin-service.c:685:2
    #8 0x7f187aa2bd18 in go_file_opener_open gnumeric/goffice/goffice/app/file.c:417:2
    #9 0x7f187d21efc5 in workbook_view_new_from_input gnumeric/gnumeric/src/workbook-view.c:1278:3
    #10 0x7f187d21fbb0 in workbook_view_new_from_uri gnumeric/gnumeric/src/workbook-view.c:1337:9
    #11 0x4e6f9f in convert gnumeric/gnumeric/src/ssconvert.c:720:9
    #12 0x4e49bc in main gnumeric/gnumeric/src/ssconvert.c:913:9
    #13 0x7f1873cfe78f in __libc_start_main (/usr/lib/libc.so.6+0x2078f)
    #14 0x438a48 in _start (apps/bin/ssconvert+0x438a48)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV gnumeric/gnumeric/plugins/excel/ms-excel-read.c:964 excel_read_string_header

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Juha Kylmänen