Fix compilation issues with ShaderLibraryCase assert
Fix compilation issues with ShaderLibraryCase assert

This assert was causing issues with some compilers/options.

Components: Framework, OpenGL

VK-GL-CTS issue: 3399

Fixes: a590d9ab4 ("Add check for ES compatibility extensions with Desktop OpenGL")
Signed-off-by: Tapani Pälli <cdcb67a5e49297de94340ca09f25994bd5e7f762@intel.com>
Change-Id: I070d82e7e9c0a4aafbda21cabd18a2d37b5b2cf0

KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS