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Brings the previous OpenSSL implementation into src/IO/tls_openssl.c.
Now, the TLS functions have the implementation name as prefix, like
a_Tls_openssl_connect().
The generic interface at IO/tls.h hides the implementation which is
selected at configure time. The appropriate functions of that
implementation are called from IO/tls.c to IO/tls_<impl>.c. In this way,
support for more TLS libraries can easily be added.
In the case of mbedTLS, there are some incompatible changes from version
2 to 3, so we use some ifdefs to fix the differences.
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