libdill: Adapt the commit-id

jfsmig · fvennetier · commit 5ec32554699e · 2020-11-20T15:16:53.000+01:00
A fix is required to build libdill on recent gcc versions (post 9.x)
diff --git a/vendor/libdill b/vendor/libdill
@@ -1 +1 @@
-Subproject commit de7a917bc39756f61237b8b779dd8be735652f88
+Subproject commit e738f9661a5f63c219ea3a7e8627237b5fa0d9c0
