fix-tests
[libc] Add a simple StringStream class.
[libc] Implement sinf function that is correctly rounded to all rounding modes.
[libc] Add dirent.h functions opendir, readdir, closedir and dirfd.
[libc][NFC] Add src.__support.OSUtil targets conditionally.
[libc] Add implementations of pthread_equal and pthread_self.
[libc] Add a convenience class and function for integer to string conversion.
[libc] Automatically add -mfma flag for architectures supporting FMA.
[libc] Add holder class for va_lists
[libc] Guard common macro names
[libc][NFC] Add explicit casts to ctype functions
[libc] apply new lint rules
[libc] fix strtofloatingpoint on rare edge case
[libc][Obvious][NFC] A bunch of cosmetic cleanup.
[libc] Add explicit casts for gcc