to 'unsigned long' (ie. odd platforms/compilers), so a pointer-typed
version was added but it required portable code to check *both* modes to
determine equality. This commit maintains the availability of both thread
ID types, but deprecates the type-specific accessor APIs that invoke the
callbacks - instead a single type-independent API is used.  This simplifies
software that calls into this interface, and should also make it less
error-prone - as forgetting to call and compare *both* thread ID accessors
could have led to hard-to-debug/infrequent bugs (that might only affect
certain platforms or thread implementations). As the CHANGES note says,
there were corresponding deprecations and replacements in the
thread-related functions for BN_BLINDING and ERR too.

Submitted by: Tobias Stoeckmann <tobias@bugol.de>

Submitted by: Ernst G. Giessmann

PR: 1578
Submitted by: Charles Longeau <chl@tuxfamily.org>

RC4_set_key.

PR: 1466

PR: 1354, 1355, 1398, 1408

PR: 1343