Fixes issue #2169.

This is causing downstream users compiler errors if they have Werror or other
particularly restrictive flags turned on.

* rework how shader interface block naming rules are handled

* Fixes 2136

According to the spec, shader interfaces (uniform blocks, buffer
blocks, input blocks, output blocks) all should be matched up via
their block names across all compilation units, not instance names.
Also, all block names can be re-used between all 4 interface types
without conflict. This change makes it so all of these blocks are
matched and remapped using block name and not by instance name.
Additional the rule that matched uniform and buffer blocks must
either be anonymous or named (but not nessearily the same name) is
now imposed.

* add warning if instance names differ between matched shader interfaces

* Add test cases from #2137 which is now fixed as well.

* replace some tab characters with spaces

* buffer blocks and uniform blocks now share the same block namespace

Error out assignments to objects of rayQueryEXT type.

Remove unused variables.

This CL removes two unused variables from the initialization code.

Humble fix

Update spirv-tools known_good to latest stable

GL_EXT_ray_query accelerationStructureEXT 

GL_EXT_ray_query pass-by-reference issues

sync to KhronosGroup/glslang

Add missing braces to if condition

The indentation implies this was the intention. Noticed the issue while trying to compile our code with -Werror -Wall

GL_EXT_ray_query updates

Fix build on CMake 2.8, and fix Web build