build failure uidnew sieve extension

The uidnew sieve extension in mailutils-3.20 needs a place to store
data. However, it is unconditionally built and linked against libmu_dbm
even when DBM support is explicitly disabled:

./configure --without-berkeley-db --without-gdbm && make
[...]
  CC       uidnew.lo
make[4]: *** No rule to make target '../../libmu_dbm/libmu_dbm.la', needed by 'uidnew.la'.  Stop.

The following patch makes uidnew dependant on DBM support:

--- a/libmu_sieve/extensions/Makefile.am	2025-08-11 16:25:13.850209754 +0200
+++ b/libmu_sieve/extensions/Makefile.am	2025-08-11 16:35:28.312393817 +0200
@@ -15,17 +15,23 @@
 ## along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
 
 moddir=$(MU_SIEVE_MODDIR)
-mod_LTLIBRARIES = \
+
+BASE_MODULES = \
  editheader.la\
  list.la\
  moderator.la\
  pipe.la\
  spamd.la\
  timestamp.la\
- uidnew.la\
  vacation.la
+
+if MU_COND_DBM
+DBM_MODULES = uidnew.la
+uidnew_la_LIBADD = ${top_builddir}/libmu_dbm/libmu_dbm.la
+endif
+
+mod_LTLIBRARIES = $(BASE_MODULES) $(DBM_MODULES)
+
 AM_CPPFLAGS = $(MU_APP_COMMON_INCLUDES)
 AM_LDFLAGS = -module -avoid-version -no-undefined -rpath '$(moddir)'
 LIBS = ../libmu_sieve.la
-
-uidnew_la_LIBADD = ${top_builddir}/libmu_dbm/libmu_dbm.la

-- 
Eray