libc: only export hesiod symbols when enabled

Create a seperate symbol file for hesiod and conditionally include it.
This allows linkage with --no-undefined-version.

Differential Revision: https://

libc: only export hesiod symbols when enabled

Create a seperate symbol file for hesiod and conditionally include it.
This allows linkage with --no-undefined-version.

Differential Revision: https://reviews.freebsd.org/D44184

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