Fix non-constant initializer error in libuuid.

Compiling libuuid was failing with the following error:

```c
libuuid/src/gen_uuid.c: In function 'uuid_generate_time_generic':
libuuid/src/gen_uuid.c:536:33: error: initializer element is not constant
  THREAD_LOCAL int  cache_size = cs_min;
```

The error was previously detected, and a fix was provided in
52abdf6a , where the GCC minimum version
was increased to 8 (GCC version 8 supports using const-declared
variables as constant expressions in some cases).

Unfortunately, the solution did not work as the `min_version` field of
the `[gcc]` section was being overwritten by its value in
`component/defaults.cfg`.
This is because `util-linux` (where libuuid config is located) is a
transient dependence of `defaults.cfg` through `python3`.

Luckily, the error is already [patched upstream](https://github.com/util-linux/util-linux/commit/07e5c29d501c19e7af84fecb5915e0f9f94cb49f)
in version 2.40.1, so we can just upgrade the library to the latest
version instead (2.40.2), which we do here.

As part of the upgrade we disable the new tools added to the package, as
we do not use them: liblastlog2, pam-lastlog2 and exch.
Otherwise the compilation would fail with the following message:

```
configure: error: liblastlog2 selected, but required sqlite3 library not available
```

See merge request nexedi/slapos!1609

component/util-linux/buildout.cfg

@@ -6,9 +6,6 @@ extends =
   ../pkgconfig/buildout.cfg
   ../xz-utils/buildout.cfg
 
-[gcc]
-min_version = 8
-
 [util-linux]
 recipe = slapos.recipe.cmmi
 shared = true
@@ -21,16 +18,19 @@ configure-options =
   --disable-bash-completion
   --disable-cal
   --disable-cramfs
+  --disable-exch
   --disable-fallocate
   --disable-fsck
   --enable-libblkid
   --disable-libfdisk
+  --disable-liblastlog2
   --enable-libmount
   --disable-makeinstall-chown
   --disable-makeinstall-setuid
   --disable-more
   --enable-mount
   --disable-nls
+  --disable-pam-lastlog2
   --disable-pivot_root
   --disable-pylibmount
   --disable-rename