Remove now-useless ALWAYS_SUBDIRS entry in src/test/Makefile.

Commit 257836a75 added the "locale" subdirectory to SUBDIRS,
but neglected to remove it from ALWAYS_SUBDIRS.  This oversight
had no functional effect because the filter-out function would
remove it anyway.  Still, it's confusing to readers to list a
subdirectory in both places, especially because it makes the
associated comment into a partial lie.

src/test/Makefile

@@ -38,7 +38,7 @@ endif
 # clean" etc to recurse into them.  (We must filter out those that we
 # have conditionally included into SUBDIRS above, else there will be
 # make confusion.)
-ALWAYS_SUBDIRS = $(filter-out $(SUBDIRS),examples kerberos ldap locale ssl)
+ALWAYS_SUBDIRS = $(filter-out $(SUBDIRS),examples kerberos ldap ssl)
 
 # We want to recurse to all subdirs for all standard targets, except that
 # installcheck and install should not recurse into the subdirectory "modules".