Bump version patch level.
diff --git a/glslang/Include/revision.h b/glslang/Include/revision.h
index 6282169..2ff52de 100644
--- a/glslang/Include/revision.h
+++ b/glslang/Include/revision.h
@@ -1,3 +1,3 @@
 // This header is generated by the make-revision script.
 
-#define GLSLANG_PATCH_LEVEL 2850
+#define GLSLANG_PATCH_LEVEL 2853