Back out ESR's erroneous commit of a DB-related change

configure.in

@@ -1014,12 +1014,6 @@ AC_SUBST(HAVE_GETHOSTBYNAME)
 # checks for system services
 # (none yet)
 
-# Cope with the DB mess.  If we detect libdba, assume it's a version 2
-# or later DB and should be linked first (before the DB 1.xx stuff in glibc).
-# Also define an appropriate symbol so we can conditionalize code in the
-# dbmmodule; the API has changed since 1.xx.
-AC_CHECK_LIB(dba, __db_mutex_lock)
-
 # Linux requires this for correct f.p. operations
 AC_CHECK_FUNC(__fpu_control,
   [],