Enable 'case_' specification test

* tests/spec/Makefile.am (TESTS): Add 'case_'.
* tests/spec/oil.scm: Filter out two Bash-specific tests.

tests/spec/Makefile.am

@@ -18,6 +18,7 @@ TEST_EXTENSIONS = .sh
 SH_LOG_COMPILER = ./check-spec
 
 TESTS =                                         \
+    oil/spec/case_.test.sh                      \
     oil/spec/quote.test.sh                      \
     oil/spec/redirect.test.sh                   \
     oil/spec/smoke.test.sh                      \

tests/spec/oil.scm

@@ -100,7 +100,11 @@
                                 out)))
                             (loop (read-line in 'concat) transformers))))))))
                  (tests-to-filter
-                  '(("spec/quote.test.sh"
+                  '(("spec/case_.test.sh"
+                     (;; These two are Bash specific.
+                      ("Case statement with ;;&")
+                      ("Case statement with ;&")))
+                    ("spec/quote.test.sh"
                      (;; We match KornShell on these two tests.
                       ("Unterminated single quote"
                        ("OK mksh" "OK mksh/geesh"))