Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibC/locale.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+enum {
+    LC_ALL,
+    LC_NUMERIC,
+    LC_CTYPE,
+    LC_COLLATE,
+    LC_TIME,
+    LC_MONETARY,
+};
+
+struct lconv {
+    char* decimal_point;
+    char* thousands_sep;
+    char* grouping;
+};
+
+struct lconv* localeconv();
+char* setlocale(int category, const char* locale);
+
+__END_DECLS