Security update for freetype2

This update for freetype2 fixes the following issues:

- CVE-2020-15999: fixed a heap buffer overflow found in the handling of embedded PNG bitmaps (bsc#1177914).

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

Fixed bugs
bnc#1177914
VUL-0: CVE-2020-15999: freetype2: A buffer overflow was discovered in Load_SBit_Png.
Selected Binaries
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