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FFI: Workaround for platform dlerror() returning NULL.

Contributed by mcclure.

(cherry picked from commit 478bcfe52)

The `ffi.load()` implementation assumes the string returned from
`dlerror()` is non-NULL and immediately dereferences it. This may lead
to a crash on POSIX platforms [1] where it is possible.

This patch adds the corresponding check and the default "dlopen failed"
error message.

Sergey Kaplun:
* added the description and the test for the problem

[1]: https://pubs.opengroup.org/onlinepubs/009695399/functions/dlerror.html

Part of tarantool/tarantool#10199

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Reviewed-by: Maxim Kokryashkin <m.kokryashkin@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

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