Fix loading of C native library on FreeBSD with JNA < 4.1.0.

[alexdupre]

For reference: java-native-access/jna#279

[klikh]

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[alexdupre]

CLA submitted.

[klikh]

Received, thanks.

[alexdupre]

Actually I'm thinking it could make more sense to rebuild the old jna library with this patch: https://people.freebsd.org/~jkim/jna.diff
This would fix not only this issue, but also other libraries (pty4j, jtermios, etc.) that uses jna to load the libc. What's your opinion?

[trespasserw]

Sounds reasonable. Just need to check what holds us back from JNA upgrade.

[trespasserw]

Status update: we're in the process of migrating to JNA 4.1 - upgrading and checking dependent libraries one-by-one.

[trespasserw]

Finished the migration to JNA 4.1 (finally :/). Sorry for it to take so long.