BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibC/include/sys/banan-os.h

@@ -0,0 +1,48 @@
+#ifndef _SYS_BANAN_OS_H
+#define _SYS_BANAN_OS_H 1
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __need_size_t 1
+#include <stddef.h>
+
+#define TTY_CMD_SET		0x01
+#define TTY_CMD_UNSET	0x02
+
+#define TTY_FLAG_ENABLE_OUTPUT	1
+#define TTY_FLAG_ENABLE_INPUT	2
+
+#define POWEROFF_SHUTDOWN 0
+#define POWEROFF_REBOOT 1
+
+struct proc_meminfo_t
+{
+	size_t page_size;
+	size_t virt_pages;
+	size_t phys_pages;
+};
+
+/*
+fildes:		refers to valid tty device
+command:	one of TTY_CMD_* definitions
+flags:		bitwise or of TTY_FLAG_* definitions
+
+return value: 0 on success, -1 on failure and errno set to the error
+*/
+int tty_ctrl(int fildes, int command, int flags);
+int poweroff(int command);
+
+int load_keymap(const char* path);
+
+// Create shared memory object and return its key or -1 on error
+long smo_create(size_t size, int prot);
+// Delete shared memory object such that it will be no longer accessible with smo_map(). Existing mappings are still valid
+int smo_delete(long key);
+// Map shared memory object defined by its key and return address or null on error. Mappings can be unmapped using munmap()
+void* smo_map(long key);
+
+__END_DECLS
+
+#endif