Security update for libmspack

This update for libmspack fixes the following issues:

Security issues fixed:

- CVE-2018-18584: The CAB block input buffer was one byte too small for the maximal Quantum block, leading to an out-of-bounds write. (bsc#1113038)
- CVE-2018-18585: chmd_read_headers accepted a filename that has '\0' as its first or second character (such as the "/\0" name). (bsc#1113039)
- Fix off-by-one bounds check on CHM PMGI/PMGL chunk numbers and reject empty filenames.

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
VUL-1: CVE-2018-18584: libmspack: CAB block input buffer extended by one byte to allow extra byte added after the block by cabd_sys_read_block
VUL-1: CVE-2018-18585: libmspack: chmd_read_headers() reject files with blank filenames,
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