RSA_get_ext_data().

like Malloc, Realloc and especially Free conflict with already existing names
on some operating systems or other packages.  That is reason enough to change
the names of the OpenSSL memory allocation macros to something that has a
better chance of being unique, like prepending them with OPENSSL_.

This change includes all the name changes needed throughout all C files.

Tidy up CRYPTO_EX_DATA structures.

Still doesn't work (the destructor on BIO and SSL is called immediately
after creating the object. Why that??)

to minimise the effects on existing code.

Submitted by:
Reviewed by:
PR: