build: fixes for latest SPIR-V rev 31

Primarily, this deals with new binding field in metadata rather than having
location field do double duty.
diff --git a/LunarGLASS_revision b/LunarGLASS_revision
index 094d649..84c37f7 100644
--- a/LunarGLASS_revision
+++ b/LunarGLASS_revision
@@ -1 +1 @@
-431d5804d21af260d5938b39575d0103aaf05b51
+93298d056180c88ea90e24afba341d4491aaf463