[PATCH] Clean up iconv/gconv_int.h for unnecessary declarations

[Arjun Shankar]

> This patch removes the extern declarations from the header file and moves
> the definitions to the compilation units where they are used.

One of the context lines in this patch depends on a patch I submitted
yesterday [1]. Nonetheless, it can still be applied by passing '-C2' to
git-apply or git-am. Apologies for the confusion.

I  am referring to this hunk in iconv/gconv_conf.c:

> @@ -420,7 +427,7 @@ read_conf_file (const char *filename, const char *directory, size_t dir_len,
>  
>  
>  /* Determine the directories we are looking for data in.  */
> -void
> +static void
>  __gconv_get_path (void)
>  {
>    /* Make sure we haven't done it already.  */

[1] https://sourceware.org/ml/libc-alpha/2017-10/msg01195.html