Package /var/lib/samba/ldb in the common-libs package

Since gensec also parses secrets.ldb all our tools like 'net' are
looking for this directory and print a warning if it doesn't exist.

samba.spec

@@ -1211,8 +1211,6 @@ rm -rf %{buildroot}
 %{_mandir}/man8/tdbtool.8*
 %endif
 
-%dir %{_libdir}/samba/ldb
-
 %if %with_internal_ldb
 %{_bindir}/ldbadd
 %{_bindir}/ldbdel
@@ -1395,6 +1393,8 @@ rm -rf %{buildroot}
 # common libraries
 %{_libdir}/samba/libpopt-samba3-samba4.so
 
+%dir %{_libdir}/samba/ldb
+
 %dir %{_libdir}/samba/pdb
 %{_libdir}/samba/pdb/ldapsam.so
 %{_libdir}/samba/pdb/smbpasswd.so