posix: options: `POSIX_THREADS` require a stack

`pthread_setspecific` requires a stack in order to allocate the
`struct pthread_key_data` data structure. On 64 bit systems this data
structure is 32 bytes, resulting in 160 bytes usage for the default 5
supported threads.

Signed-off-by: Jordan Yates <jordan@embeint.com>
1 file changed