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

Test case: http://jutaky.com/fuzzing/gnumeric_case_004-ms-excel-read.c.1284.xls

$ ssconvert gnumeric_case_004-ms-excel-read.c.1284.xls /tmp/out.gnumeric

==12218==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fdbed07a32a bp 0x7fff761c3ed0 sp 0x7fff761c3668 T0)
    #0 0x7fdbed07a329 in __GI_strlen (/usr/lib/libc.so.6+0x80329)
    #1 0x4ac2ad in __interceptor_strlen (apps/bin/ssconvert+0x4ac2ad)
    #2 0x7fdbce029cf6 in sst_read_string gnumeric/gnumeric/plugins/excel/ms-excel-read.c:1284:16
    #3 0x7fdbce01ea5d in excel_read_SST gnumeric/gnumeric/plugins/excel/ms-excel-read.c:1330:12
    #4 0x7fdbcdff582c in excel_read_workbook gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7312:21
    #5 0x7fdbcdf87441 in excel_enc_file_open gnumeric/gnumeric/plugins/excel/boot.c:170:4
    #6 0x7fdbcdf88e94 in excel_file_open gnumeric/gnumeric/plugins/excel/boot.c:273:2
    #7 0x7fdbf2be1e30 in go_plugin_loader_module_func_file_open gnumeric/goffice/goffice/app/go-plugin-loader-module.c:282:3
    #8 0x7fdbf2bf59b4 in go_plugin_file_opener_open gnumeric/goffice/goffice/app/go-plugin-service.c:685:2
    #9 0x7fdbf2c031c8 in go_file_opener_open gnumeric/goffice/goffice/app/file.c:417:2
    #10 0x7fdbf458d34a in workbook_view_new_from_input gnumeric/gnumeric/src/workbook-view.c:1278:3
    #11 0x7fdbf458df40 in workbook_view_new_from_uri gnumeric/gnumeric/src/workbook-view.c:1337:9
    #12 0x4e1031 in convert gnumeric/gnumeric/src/ssconvert.c:721:9
    #13 0x4ded93 in main gnumeric/gnumeric/src/ssconvert.c:913:9
    #14 0x7fdbed01a78f in __libc_start_main (/usr/lib/libc.so.6+0x2078f)
    #15 0x437c58 in _start (apps/bin/ssconvert+0x437c58)

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Juha Kylmänen