Merge pull request #379 from secondlife/davep/SL-19842

.github/workflows/build.yaml

indra/llinventory/llsettingssky.cpp

indra/llinventory/llsettingssky.h

indra/llmessage/CMakeLists.txt

indra/llmessage/llgenericstreamingmessage.cpp

indra/llmessage/llgenericstreamingmessage.h

indra/llmessage/message_prehash.cpp

indra/llmessage/message_prehash.h

indra/llprimitive/llgltfmaterial.cpp

indra/llprimitive/llgltfmaterial.h

indra/llrender/llrender.cpp

indra/llrender/llshadermgr.cpp

indra/llrender/llshadermgr.h

indra/newview/app_settings/settings.xml

...ngs/shaders/class1/deferred/postDeferredGammaCorrect.glsl

..._settings/shaders/class1/windlight/atmosphericsFuncs.glsl

.../newview/app_settings/shaders/class2/deferred/alphaF.glsl

...wview/app_settings/shaders/class2/deferred/pbralphaF.glsl

...pp_settings/shaders/class2/deferred/reflectionProbeF.glsl

...pp_settings/shaders/class3/deferred/fullbrightShinyF.glsl