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/sys/banan-os.cpp

@@ -0,0 +1,36 @@
+#include <sys/banan-os.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int tty_ctrl(int fildes, int command, int flags)
+{
+	return syscall(SYS_TTY_CTRL, fildes, command, flags);
+}
+
+int poweroff(int command)
+{
+	return syscall(SYS_POWEROFF, command);
+}
+
+int load_keymap(const char* path)
+{
+	return syscall(SYS_LOAD_KEYMAP, path);
+}
+
+long smo_create(size_t size, int prot)
+{
+	return syscall(SYS_SMO_CREATE, size, prot);
+}
+
+int smo_delete(long key)
+{
+	return syscall(SYS_SMO_DELETE, key);
+}
+
+void* smo_map(long key)
+{
+	long ret = syscall(SYS_SMO_MAP, key);
+	if (ret < 0)
+		return nullptr;
+	return reinterpret_cast<void*>(ret);
+}