aspell vulnerabilities (OSS-Fuzz)

2 vulnerabilities.

• aspell OSS-Fuzz Heap-buffer-overflow in acommon::DecodeDirect<unsigned short>::decode OSV-2020-548 Fix available No scoreJuly 1, 2020
• aspell OSS-Fuzz Heap-buffer-overflow in acommon::ObjStack::dup_top OSV-2020-521 Fix available No scoreJuly 1, 2020