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ping: fix include guard symbol name to reflect the header file name

Description

ping: fix include guard symbol name to reflect the header file name

Submitted by: Ján Sučan <sucanjan@gmail.com>
MFC after: 2 weeks
MFC-With: 351171
Sponsored by: Google LLC (Google Summer of Code 2019)
Differential Revision: https://reviews.freebsd.org/D21374

Details