Add another test case for meta generation (#449)

A library that has been pp'd with a preprocessor that has runtime deps

test/blackbox-tests/test-cases/meta-gen/jbuild

@@ -35,6 +35,13 @@
   (public_name foobar.rewriter2)
   (ppx_runtime_libraries (foobar_runtime_lib2))))
 
+(library
+ ((name foobar_ppd)
+  (public_name foobar.ppd)
+  (synopsis "pp'd with a rewriter")
+  (libraries (foobar))
+  (preprocess (pps (foobar_rewriter)))))
+
 (alias
  ((name runtest)
   (action (echo "${read:META.foobar}"))))

test/blackbox-tests/test-cases/meta-gen/run.t

@@ -14,6 +14,15 @@
     plugin(byte) = "foobar_baz.cma"
     plugin(native) = "foobar_baz.cmxs"
   )
+  package "ppd" (
+    directory = "ppd"
+    description = "pp'd with a rewriter"
+    requires = "foobar"
+    archive(byte) = "foobar_ppd.cma"
+    archive(native) = "foobar_ppd.cmxa"
+    plugin(byte) = "foobar_ppd.cma"
+    plugin(native) = "foobar_ppd.cmxs"
+  )
   package "rewriter" (
     directory = "rewriter"
     description = "ppx rewriter"