(rfc822-1): Compensate for Solaris 5.9's /bin/sh,

which emits a diagnostic to stderr when this test's LC_ALL=de_DE
cannot be honored.

tests/misc/date

@@ -149,6 +149,9 @@ my @Tests =
 
      # test for RFC-822 conformance
      ['rfc822-1', "-R -d '$d1'", {OUT=>"Sun, 19 Jan 1997 08:17:48 +0000"},
+      # Solaris 5.9's /bin/sh emits this diagnostic to stderr
+      # if you don't have support for the named locale.
+      {ERR_SUBST => q!s/^couldn't set locale correctly\n//!},
       {ENV => 'LC_ALL=de_DE TZ=UTC0'}],
 
      # Relative seconds, with time.  fixed in 2.0j