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/time.h

@@ -0,0 +1,32 @@
+#ifndef _SYS_TIME_H
+#define _SYS_TIME_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_time.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+// NOTE: select is declared from here
+#include <sys/select.h>
+
+#include <bits/types/timeval.h>
+
+struct itimerval
+{
+	struct timeval it_interval;	/* Timer interval. */
+	struct timeval it_value;	/* Current value. */
+};
+
+#define ITIMER_REAL		0
+#define ITIMER_VIRTUAL	1
+#define ITIMER_PROF		2
+
+int getitimer(int which, struct itimerval* value);
+int gettimeofday(struct timeval* __restrict tp, void* __restrict tzp);
+int setitimer(int which, const struct itimerval* __restrict value, struct itimerval* __restrict ovalue);
+int utimes(const char* path, const struct timeval times[2]);
+
+__END_DECLS
+
+#endif