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.
Win32 version of rename() ). There isn't a precise rename() equivalent under
Win95: the standard rename() complains if the destination already exists so
replaced with a combination of unlink() and MoveFile().
