update submodules

diff --git a/c-libtree b/c-libtree
index 85b32692acd624350be7c90c51ec65e34c06e0c2..a7d1752bf838684041a584b316b030216c9f8b4c 160000 (submodule)
--- a/c-libtree
+++ b/c-libtree
@@ -1 +1 @@
-Subproject commit 85b32692acd624350be7c90c51ec65e34c06e0c2
+Subproject commit a7d1752bf838684041a584b316b030216c9f8b4c

diff --git a/c-subtree b/c-subtree
index 2d8c3df582472a3c894871d5c21733b9a7cfce6c..da9d0167201833f998f0f4298cd6a6eef88c590a 160000 (submodule)
--- a/c-subtree
+++ b/c-subtree
@@ -1 +1 @@
-Subproject commit 2d8c3df582472a3c894871d5c21733b9a7cfce6c
+Subproject commit da9d0167201833f998f0f4298cd6a6eef88c590a

diff --git a/c-tsttree b/c-tsttree
index a6f5d9b9ffc502faa202e261e4bac0e9b79d891e..1dcca25a981d03d56994a571dbf4ff947468045e 160000 (submodule)
--- a/c-tsttree
+++ b/c-tsttree
@@ -1 +1 @@
-Subproject commit a6f5d9b9ffc502faa202e261e4bac0e9b79d891e
+Subproject commit 1dcca25a981d03d56994a571dbf4ff947468045e