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/utime.h

@@ -0,0 +1,23 @@
+#ifndef _UTIME_H
+#define _UTIME_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/utime.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __need_time_t
+#include <sys/types.h>
+
+struct utimbuf
+{
+	time_t actime;	/* Access time. */
+	time_t modtime;	/* Modification time. */
+};
+
+int utime(const char* path, const struct utimbuf* times);
+
+__END_DECLS
+
+#endif