libc: Refine the inline handling

1.Remove CONFIG_HAVE_INLINE macro
2.Change the ANSI C function to normal function
3.Other simple non ANSI function to macro

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

include/cxx/cstring

@@ -88,11 +88,6 @@ namespace std
 
   // Declared in legacy strings.h
 
-  using ::bcmp;
-  using ::bcopy;
-  using ::bzero;
-  using ::index;
-  using ::rindex;
   using ::ffs;
   using ::strcasecmp;
   using ::strncasecmp;