[Libc] Add some errno to `armlibc/sys/errno.h`.
#define EPERM 1 /* Not super-user */
#define ESRCH 3 /* No such process */
#define EINTR 4 /* Interrupted system call */
+#define EACCES 13 /* Permission denied */
#define EFAULT 14 /* Bad address */
#define ENFILE 23 /* Too many open files in system */
#define ERANGE 34 /* Math result not representable */
#define ECONNABORTED 103 /* Software caused connection abort */
#define ECONNRESET 104 /* Connection reset by peer */
#define ENOBUFS 105 /* No buffer space available */
+#define EISCONN 106 /* Transport endpoint is already connected */
#define ENOTCONN 107 /* Transport endpoint is not connected */
#define EINPROGRESS 115 /* Operation now in progress */
#define ETIMEDOUT 116 /* Connection timed out */
