Match and link IObj

Former-commit-id: bef91d45de

libc/ctype.h

@@ -29,21 +29,6 @@ extern unsigned char __upper_map[];
 #define __control (__motion_char | __control_char)
 #define __zero_fill(c) ((int)(unsigned char)(c))
 
-int isalnum(int);
-int isalpha(int);
-int iscntrl(int);
-int isdigit(int);
-int isgraph(int);
-int islower(int);
-int isprint(int);
-int ispunct(int);
-int isspace(int);
-int isupper(int);
-int isxdigit(int);
-int tolower(int);
-int toupper(int);
-int iswblank(int);
-
 #ifndef _CTYPE_INLINE
 #define _CTYPE_INLINE static inline
 #endif