Recommended update for gpp

This update for gpp fixes the following issues:

Update to version 2.28:

* Fixed typos in documentation (Issues #57 and #61)
* Added #sinclude meta-macro for silent includes (Issue #63)

Fixed bugs
bnc#1108673
VUL-1: CVE-2018-17076: gpp: segmentation fault via a crafted file
Selected Binaries
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