Revert to vanilla Collections-C (phew).

.gitmodules

@@ -11,5 +11,4 @@
     url = https://github.com/centaurean/spookyhash.git
 [submodule "ext/collections-c"]
     path = ext/collections-c
-    url = https://github.com/scossu/lsup-collections-c.git
-    branch = lsup
+    url = https://github.com/srdja/Collections-C

ext/collections-c

@@ -1 +1 @@
-Subproject commit 402d5fa7d29000a578dbaba425179d45115e7f10
+Subproject commit a188188f61b5ab3d5614446de3a3674a620e73b9