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/glob.h

@@ -0,0 +1,37 @@
+#ifndef _GLOB_H
+#define _GLOB_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/glob.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __need_size_t
+#include <sys/types.h>
+
+#define GLOB_APPEND		0x01
+#define GLOB_DOOFFS		0x02
+#define GLOB_ERR		0x04
+#define GLOB_MARK		0x08
+#define GLOB_NOCHECK	0x10
+#define GLOB_NOESCAPE	0x20
+#define GLOB_NOSORT		0x40
+
+#define GLOB_ABORTED	1
+#define GLOB_NOMATCH	2
+#define GLOB_NOSPACE	3
+
+struct glob_t
+{
+	size_t gl_pathc;	/* Count of paths matched by pattern. */
+	char** gl_pathv;	/* Pointer to a list of matched pathnames. */
+	size_t gl_offs;		/* Slots to reserve at the beginning of gl_pathv. */
+};
+
+int		glob(const char* __restrict pattern, int flags, int (*errfunc)(const char* epath, int eerrno), glob_t* __restrict pglob);
+void	globfree(glob_t* pglob);
+
+__END_DECLS
+
+#endif