update submodules

diff --git a/external/glutess b/external/glutess
index bca91cb2ee1e3a3ad31d6fe01bfb8f3c9aaea7c1..28098202d43453598441f5fbf5c74a6ded11ae15 160000 (submodule)
--- a/external/glutess
+++ b/external/glutess
@@ -1 +1 @@
-Subproject commit bca91cb2ee1e3a3ad31d6fe01bfb8f3c9aaea7c1
+Subproject commit 28098202d43453598441f5fbf5c74a6ded11ae15

diff --git a/external/vkvg-svg b/external/vkvg-svg
index f379cb7d065936ed96172aa92ef11d0c462de57f..ed6f7983809488661c140dc0b52e2b9e2c7867e0 160000 (submodule)
--- a/external/vkvg-svg
+++ b/external/vkvg-svg
@@ -1 +1 @@
-Subproject commit f379cb7d065936ed96172aa92ef11d0c462de57f
+Subproject commit ed6f7983809488661c140dc0b52e2b9e2c7867e0

diff --git a/vkh b/vkh
index b93fc9f9d0c9c3e793ff5d2fdbeaf86009e0f905..d17d759e06d5a96aeb3d5e06474b6ec7ecbb0b93 160000 (submodule)
--- a/vkh
+++ b/vkh
@@ -1 +1 @@
-Subproject commit b93fc9f9d0c9c3e793ff5d2fdbeaf86009e0f905
+Subproject commit d17d759e06d5a96aeb3d5e06474b6ec7ecbb0b93