security/libkleo fails to build w/error "bad_C++_code"

[Richard Susgin]

freebsd-version -ku
12.1-RELEASE-p11
12.1-RELEASE-p12

pkg -v
1.16.1

pkg info -x poudriere
poudriere-devel-3.3.99.20200326_2

It just looks like a lot of errors with functions.
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