Simplify creation of /etc/mtab symlink

It was created unconditionally in %post, so the original contents (if
any) were overwritten. Listing is as %config was just misleading.
Let's simply list the symlink as normal contents in the rpm, so that
rpm can install the symlink for us.

(The scriplet was missing a dependency on coreutils for ln, but let's
not add that if we can drop the whole thing.)

util-linux.spec

@@ -433,11 +433,6 @@ find  $RPM_BUILD_ROOT%{_mandir}/man8 -regextype posix-egrep  \
 	-printf "%{_mandir}/man8/%f*\n" >> %{name}.files
 
 
-%post -n util-linux-core
-if [ ! -L /etc/mtab ]; then
-	ln -sf ../proc/self/mounts /etc/mtab || :
-fi
-
 %pre -n uuidd
 getent group uuidd >/dev/null || groupadd -r uuidd
 getent passwd uuidd >/dev/null || \
@@ -740,7 +735,6 @@ fi
 
 
 %files -n util-linux-core
-%ghost %verify(not md5 size mtime) %config(noreplace,missingok) /etc/mtab
 %attr(4755,root,root)	%{_bindir}/mount
 %attr(4755,root,root)	%{_bindir}/umount
 %{_bindir}/chrt
@@ -826,6 +820,7 @@ fi
 %{_sbindir}/swapoff
 %{_sbindir}/swapon
 %{_sbindir}/switch_root
+/etc/mtab
 
 
 %files -n util-linux-user