libqt4: fixed stack-based buffer overflow in glyph handling (CVE-2011-3922)

A stack-based buffer overflow in the glyph handling of
libqt4's harfbuzz has been fixed. CVE-2011-3922 has been
assigned to this issue.

Fixed bugs
bnc#739904
VUL-0: CVE-2011-3922: harfbuzz (libqt4): stack-based buffer overflow in glyph handling
Selected Binaries
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