LibC: Start work on locales

This patch adds 2 locales, POSIX locale and UTF8 locale.

functions `mbstowcs()` and `strcoll()` use locales to do convertions and
comparison respectively.

userspace/libraries/LibC/include/bits/types/locale_t.h

@@ -9,7 +9,7 @@ __BEGIN_DECLS
 
 #ifndef __locale_t_defined
 	#define __locale_t_defined 1
-	typedef int locale_t;
+	typedef enum { LOCALE_INVALID, LOCALE_POSIX, LOCALE_UTF8 } locale_t;
 #endif
 
 __END_DECLS