glslang 3rd-party library does not compile on modern Clang

[ebatsin]

Description

I get a compilation error in glslang using Clang 10.0.0 (In PoolAlloc.h, setAllocator tries to call private operator= on a TPoolAllocator). This issue only happens on modern versions of Clang that try to compile this method even if it is not used by renderdoc.

This issue have been fixed upstream here: KhronosGroup/glslang#2010

The first version of glslang that contains the changes should be 8.13.3559 (but simply removing the setAllocator method fixes the issue if updating glslang version is a problem).

Steps to reproduce

CMake and build renderdoc with Clang 10 with the default CMake options (I just forced BUILD_TYPE to "Release")

Environment

• RenderDoc version: master (f29fe58)
• Operating System: Arch Linux
• Compiler: Clang++10
• Build System: Ninja
• Graphics API: -

[baldurk]

Updated glslang to latest and also fixed another warning elsewhere that was firing on clang 10.