tighten scope in libidu/, too

Mark with "extern" the symbols that belong that way.
Make the others static.
* libidu/dynvec.h (dv_fill):
* libidu/fnprint.c (cw_dlink):
* libidu/hash.h (qsort_cmp_t):
* libidu/idfile.h (io_func_t):
* libidu/scanners.c (lang_args_obstack, languages_0, languages_N):
(language_help_me, language_getopt, get_language):
(lang_args_index):
* libidu/walker.c (largest_member_file):
* maint.mk (extract_char, today):
* src/fid.c (long_options):
* src/fnid.c (cw_dlink):
* src/lid.c (cw_dlink):
* src/xtokid.c (cw_dlink):

1 files changed, 2 insertions, 1 deletions

diff --git a/src/fnid.c b/src/fnid.c
index 0dbf269..d20c543 100644
--- a/src/fnid.c
+++ b/src/fnid.c
@@ -38,8 +38,9 @@ void usage (void);
 char const *program_name;
 static int show_version = 0;
 static int show_help = 0;
+static struct file_link *cw_dlink;
+
 struct idhead idh;
-struct file_link *cw_dlink;
 
 /* How shall we separate file names?  */