CRYPTO_get_idptr_callback(), CRYPTO_thread_idptr() for a 'void *' type
thread ID, since the 'unsigned long' type of the existing thread ID
does not always work well.

Submitted by: Masashi Fujita
Reviewed by: Bodo Moeller

and response verification.

Submitted by: Zoltan Glozik <zglozik@opentsa.org>
Reviewed by: Ulf Moeller

Change assignment strategy: rathern than using max+r for new codes,
find first hole in list of existing codes.

and mkdef.pl spinning in endless loop.

to handle multi-line comments and endless loop while parsing overloaded
gnu-ish __attribute__].

PR: 1243

it from mkdef.pl.

more work, i.e. more modifications are due...