[libc] Remove unused _Thread_local define from headers. (#156967) It was added in dd33f9cdef9f6209aa34713e1417f4a2e24e5ca6 to describe thread-local errno, but is no longer used in the codebase (with the exception of a single integration test, but the llvm-libc-provided `#define _Thread_local thread_local` is not needed there anyway, since `_Thread_local` is a keyword from C11 onwards.
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