RT2163: Remove some unneeded #include's

Several files #include stdio.h and don't need it.
Also, per tjh, remove BN_COUNT

Reviewed-by: Emilia Kasper <emilia@openssl.org>
RT2942: CRYPTO_set_dynlock_create_callback doc fix

The file param is "const char*" not "char*"

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>