master
use wrapper headers to hide most namespaced/internally-public symbols
make __getauxval a public ABI symbol
use the correct attributes for ___errno_location
overhaul internally-public declarations using wrapper headers
introduce namespace-safe rwlock aliases; use in pthread_key_create
make FILE a complete type for pre-C11 standard profiles
add qsort_r and make qsort a wrapper around it
refactor thrd_sleep and nanosleep in terms of clock_nanosleep
move aio implementation details to a proper internal header