add a test for remote meta submodule access

pollen/private/ts.rktd

@@ -1 +1 @@
-1469050349
+1469050761

pollen/test/data/metas/metatest.html.pm

@@ -0,0 +1,3 @@
+#lang pollen
+◊(define-meta foo 42)
+Zut Alors

pollen/test/test-submodule.rkt

@@ -0,0 +1,5 @@
+#lang racket/base
+(require rackunit racket/runtime-path)
+(define-runtime-path meta-test "data/metas/metatest.html.pm")
+(define metas (dynamic-require `(submod ,meta-test metas) 'metas))
+(check-equal? (hash-ref metas 'foo) 42)