LibC: Rewrite all the headers.

We now have more or less posix issue 2018 conforming libc headers.

This was a really time consuming and boring operation but it had to
be done.

Now we get to actually start implementing libc :)

libc/include/sys/syscall.h

@@ -1,3 +1,23 @@
-#pragma once
+#ifndef _SYS_SYSCALL_H
+#define _SYS_SYSCALL_H 1
 
-#include <kernel/Syscall.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define SYS_EXIT 1
+#define SYS_READ 2
+#define SYS_WRITE 3
+#define SYS_TERMID 4
+#define SYS_CLOSE 5
+#define SYS_OPEN 6
+#define SYS_ALLOC 7
+#define SYS_FREE 8
+#define SYS_SEEK 9
+#define SYS_TELL 10
+#define SYS_GET_TERMIOS 11
+#define SYS_SET_TERMIOS 12
+
+__END_DECLS
+
+#endif