Squash commits for public release

libs/libc/include/errno.h

@@ -0,0 +1,10 @@
+#ifndef _LIBC_ERRNO_H
+#define _LIBC_ERRNO_H
+
+#include <bits/errno.h>
+
+extern int errno;
+
+#define set_errno(x) (errno = x)
+
+#endif