Use mreadlink_with_size (doesn't exit), not xreadlink_with_size.

* bootstrap.conf (gnulib_modules): Add readlink-with-size.
Remove xreadlink and xreadlink-with-size.
* src/copy.c (copy_internal): Use mreadlink_with_size,
not xreadlink_with_size.
* src/ls.c (get_link_name): Likewise.
* src/readlink.c (main): Likewise.
* src/stat.c (print_stat): Likewise.

lib/.cvsignore

@@ -234,6 +234,8 @@ mountlist.c
 mountlist.h
 mpsort.c
 mpsort.h
+mreadlink-with-size.c
+mreadlink.h
 nanosleep.c
 netinet_in.h
 netinet_in_.h
@@ -424,9 +426,6 @@ xmemcoll.c
 xmemcoll.h
 xnanosleep.c
 xnanosleep.h
-xreadlink-with-size.c
-xreadlink.c
-xreadlink.h
 xsize.h
 xstrndup.c
 xstrndup.h

lib/.gitignore

@@ -228,6 +228,8 @@ mountlist.c
 mountlist.h
 mpsort.c
 mpsort.h
+mreadlink-with-size.c
+mreadlink.h
 nanosleep.c
 netinet_in.h
 netinet_in_.h
@@ -415,9 +417,6 @@ xmemcoll.c
 xmemcoll.h
 xnanosleep.c
 xnanosleep.h
-xreadlink-with-size.c
-xreadlink.c
-xreadlink.h
 xsize.h
 xstrndup.c
 xstrndup.h