fix-tests
[libc] Add dirent.h functions opendir, readdir, closedir and dirfd.
[libc][NFC] Remove all Linux specific code to respective linux/ directories
[libc][NFC] Add explicit casts to ctype functions
[libc] Make the errno macro resolve to the thread local variable directly.
[libc][NFC] Make explicit uint16_t casts in fenv
[libc] Add imaxabs
[libc] Use nearest_integer instructions to improve expm1f performance.
[libc] Add implementations of pthread_equal and pthread_self.
[libc][nfc] move printf inf/nan to separate function
[libc] Don't call user comparator function for equal pointers
[libc] Fix missing static_cast
[libc] Add implementation of POSIX lseek function.
[libc] Add a .clang-tidy file for the toplevel libc directory.