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net-mgmt/check_nwc_health: Use PERL instead of PERL5 for shebang

Description

net-mgmt/check_nwc_health: Use PERL instead of PERL5 for shebang
as suggested by mat@

Reported by: mat
Approved by: ler (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D20489