This removes the following unused compile definitions:
- HAVE_OSSL_SET_MAX_THREADS
- HAVE_ARGON2ID_HASH_RAW
The CHECK_FUNC_IN_HEADER() function defines the 'HAVE_<FUNCTION>'
compile definitions to 0 or 1, but these aren't used in the code.
Defining such preprocessor macros makes it difficult to track and sync
with other build systems.
f99ca6347f
