C11 and POSIX compatibility library overview

The C11 and POSIX compatibility library provides:

• compiler feature definitions: lely/features.h
• atomics: lely/libc/stdatomic.h
• max_align_t: lely/libc/stddef.h
• getdelim(), getline(), asprintf() and vasprintf(): lely/libc/stdio.h
• aligned_alloc(), aligned_free() and setenv(): lely/libc/stdlib.h
• noreturn: lely/libc/stdnoreturn.h
• strdup(), strndup() and strnlen(): lely/libc/string.h
• ffs(), strcasecmp() and strncasecmp(): lely/libc/strings.h
• clockid_t, ssize_t: lely/libc/sys/types.h
• threads: lely/libc/threads.h
• struct timespec, nanosleep(), timespec_get() and POSIX Realtime Extensions: lely/libc/time.h
• char16_t and char32_t: lely/libc/uchar.h
• getopt(): lely/libc/unistd.h