fix-tests
[libc] Make the errno macro resolve to the thread local variable directly.
[libc] apply new lint rules
[libc] Introduce asctime, asctime_r to LLVM libc
[libc] Introduces gmtime_r to LLVM libc, based on C99/C2X/Single Unix Sp.
This introduces gmtime to LLVM libc, based on C99/C2X/Single Unix Spec.
Initial commit of mktime.