symbols test: drop LIBRESSL_INTERNAL

This tests the external API, so it should not have visibility to the
inside. Silences two warnings since EC_{GROUP,POINT}_clear_free() are
now wrapped in #ifndef

symbols test: drop LIBRESSL_INTERNAL

This tests the external API, so it should not have visibility to the
inside. Silences two warnings since EC_{GROUP,POINT}_clear_free() are
now wrapped in #ifndef LIBRESSL_INTERNAL.

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Drop bogus DPADD += ${LIBSSL}

Instead of enumerating the files to clean by hand, set PROGS=${TESTS}.

Suggested by jsing

Now that all *_free() functions are NULL safe, we can generate the
freenull test from Symbols.list.

Suggested by jsing, discussed with beck and bluhm.

Add regress for free functions that should be safe with NULL