Roll STB to fix a warning
diff --git a/third_party/stb b/third_party/stb
index 3e7f2d6..c711058 160000
--- a/third_party/stb
+++ b/third_party/stb
@@ -1 +1 @@
-Subproject commit 3e7f2d6ebddfe54bd9a9491db1349513a357bfe5
+Subproject commit c7110588a4d24c4bb5155c184fbb77dd90b3116e