Bring over changes from source of truth in pkgsrc - bump version to 20200503

Update netpgpverify and libnetpgpverify to version 20200503

ensure all exported functions use a unique prfix, so that

Bring over changes from source of truth in pkgsrc - bump version to 20200503

Update netpgpverify and libnetpgpverify to version 20200503

ensure all exported functions use a unique prfix, so that they don't
conflict with symbols (both data and text) in libcrypto. this works for
statically linked binaries and libraries, rather then the version map which
only works for dynalically-linked.

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Sync the src version of netpgpverify with the version in pkgsrc

> ----------------------------
> revision 1.10
> date: 2015-02-04 16:58:02 -0800; author: agc; state: Exp; lines: +1 -0; commitid:

Sync the src version of netpgpverify with the version in pkgsrc

> ----------------------------
> revision 1.10
> date: 2015-02-04 16:58:02 -0800; author: agc; state: Exp; lines: +1 -0; commitid: 0v3HoBPFTnhDSK8y;
> appease compiler warning police - initialise a variable in case it's otherwise
> "used uninitialised". ride previous version bump.
> ----------------------------
> revision 1.9
> date: 2015-02-04 16:21:57 -0800; author: agc; state: Exp; lines: +48 -21; commitid: ElUADrlljB46GK8y;
> Update netpgpverify (and libnetpgpverify) to version 20150205
>
> + recognise signatures made by subkeys as well as by primary keys
>
> + print out the relevant key which signed the file, even if it's
> a subkey and not the primary key itself.
>
> + keep the same API as before
>
> with many thanks to Jonathan Perkin
> ----------------------------
> revision 1.8
> date: 2015-02-03 13:34:57 -0800; author: agc; state: Exp; lines: +1 -3; commitid: 6qTclEbv7hmZMB8y;
> Update netpgpverify, and libnetpgpverify, to 20150204
>
> + dump the huge output in testing script to /dev/null so that we can
> see what's happening with the other tests in testit.sh
>
> + fix from jperkin@, don't try to be clever when selecting the only
> key id in a keyring
>
> + add a test for single key (non-ssh) pubring
> ----------------------------
> revision 1.7
> date: 2015-02-03 13:13:17 -0800; author: agc; state: Exp; lines: +3 -0; commitid: ztXbqAi9ocXGFB8y;
> Update netpgpverify, and libnetpgpverify, to 20150203
>
> + portability fixes to make netpgpverify build on freebsd 10.1 with WARNS=5
>
> + fixed an oversight in the testit.sh script

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Bring over the standalone netpgpverify sources from
pkgsrc/security/netpgpverify.

No functional change.