lib/idcache.c: Remove all uses of the register keyword.

[Jim Meyering]

Another syntax-only change:

        * lib/idcache.c (getuser): Remove all uses of the register keyword.
        (getuidbyname, getgroup, getgidbyname): Likewise.

Index: lib/idcache.c
===================================================================
RCS file: /sources/gnulib/gnulib/lib/idcache.c,v
retrieving revision 1.20
diff -u -r1.20 idcache.c
--- lib/idcache.c       20 Nov 2006 09:25:38 -0000      1.20
+++ lib/idcache.c       20 Nov 2006 09:30:32 -0000
@@ -54,7 +54,7 @@
 char *
 getuser (uid_t uid)
 {
-  register struct userid *tail;
+  struct userid *tail;
   struct passwd *pwent;

   for (tail = user_alist; tail; tail = tail->next)
@@ -80,7 +80,7 @@
 uid_t *
 getuidbyname (const char *user)
 {
-  register struct userid *tail;
+  struct userid *tail;
   struct passwd *pwent;

   for (tail = user_alist; tail; tail = tail->next)
@@ -130,7 +130,7 @@
 char *
 getgroup (gid_t gid)
 {
-  register struct userid *tail;
+  struct userid *tail;
   struct group *grent;

   for (tail = group_alist; tail; tail = tail->next)
@@ -156,7 +156,7 @@
 gid_t *
 getgidbyname (const char *group)
 {
-  register struct userid *tail;
+  struct userid *tail;
   struct group *grent;

   for (tail = group_alist; tail; tail = tail->next)