Enable 'quote' specification test

* tests/spec/Makefile.am (TESTS): Add 'quote'.
* tests/spec/oil.scm: Patch two of its tests and filter out six
others.

tests/spec/Makefile.am

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

tests/spec/oil.scm

@@ -100,7 +100,20 @@
                                 out)))
                             (loop (read-line in 'concat) transformers))))))))
                  (tests-to-filter
-                  '(("spec/word-split.test.sh"
+                  '(("spec/quote.test.sh"
+                     (;; We match KornShell on these two tests.
+                      ("Unterminated single quote"
+                       ("OK mksh" "OK mksh/geesh"))
+                      ("Unterminated double quote"
+                       ("OK mksh" "OK mksh/geesh"))
+                      ;; The rest of these are well beyond POSIX.
+                      ("$''")
+                      ("$'' with quotes")
+                      ("$'' with newlines")
+                      ("$'' octal escapes don't have leading 0")
+                      ("$'' octal escapes with fewer than 3 chars")
+                      ("$\"\"")))
+                    ("spec/word-split.test.sh"
                      (;; This test requires local variables, which is
                       ;; a Bash extension.
                       ("IFS is scoped")