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sslsocket: fix "attempt to redefine 'SSL_*'" error

Different libraries can use FFI OpenSSL bindings.
E.g. cartridge already uses it:
https://github.com/tarantool/cartridge/blob/master/cartridge/sslsocket.lua

Right now there is no any significant difference in cdef. But in
future it can be different (e.g. after implementation of #207).
Since we use "struct SSL_METHOD {} SSL_METHOD" definition
it can cause errors like 'attempt to
redefine 'SSL_METHOD'" that lead to the case then pcall silently
handle an error but some symbols won't be defined.

This patch fixes such case.
That's only relevant for struct definitions. Functions and typedefs can be redefined.

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