SL-18229 Fix for PBR materials on HUDs misbehaving. Incidental decruft.

indra/llrender/llglslshader.cpp

indra/llrender/llglslshader.h

indra/llrender/llshadermgr.cpp

...wview/app_settings/shaders/class1/deferred/pbralphaV.glsl

...view/app_settings/shaders/class1/deferred/pbropaqueF.glsl

...view/app_settings/shaders/class1/deferred/pbropaqueV.glsl

...gs/shaders/class1/lighting/lightFullbrightAlphaMaskF.glsl

...pp_settings/shaders/class1/lighting/lightFullbrightF.glsl

.../class1/lighting/lightFullbrightNonIndexedAlphaMaskF.glsl

...s/shaders/class1/lighting/lightFullbrightNonIndexedF.glsl

...aders/class1/lighting/lightFullbrightWaterAlphaMaskF.glsl

...ttings/shaders/class1/lighting/lightFullbrightWaterF.glsl

...s1/lighting/lightFullbrightWaterNonIndexedAlphaMaskF.glsl

...ders/class1/lighting/lightFullbrightWaterNonIndexedF.glsl

...view/app_settings/shaders/class1/objects/fullbrightF.glsl

...view/app_settings/shaders/class1/objects/fullbrightV.glsl

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

indra/newview/lldrawpoolalpha.cpp

indra/newview/lldrawpoolalpha.h

indra/newview/lldrawpoolpbropaque.cpp