SH-2908 More complete GLSL 1.20 compatibility pass.

...newview/app_settings/shaders/class1/deferred/avatarF.glsl

...a/newview/app_settings/shaders/class1/deferred/bumpF.glsl

...newview/app_settings/shaders/class1/deferred/cloudsF.glsl

...p_settings/shaders/class1/deferred/diffuseAlphaMaskF.glsl

...ngs/shaders/class1/deferred/diffuseAlphaMaskIndexedF.glsl

...ngs/shaders/class1/deferred/diffuseAlphaMaskNoColorF.glsl

...ewview/app_settings/shaders/class1/deferred/diffuseF.glsl

...app_settings/shaders/class1/deferred/diffuseIndexedF.glsl

...a/newview/app_settings/shaders/class1/deferred/fxaaF.glsl

indra/newview/app_settings/shaders/class1/deferred/giF.glsl

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

...pp_settings/shaders/class1/deferred/multiPointLightF.glsl

indra/newview/app_settings/shaders/class1/deferred/skyF.glsl

.../newview/app_settings/shaders/class1/deferred/starsF.glsl

...ewview/app_settings/shaders/class1/deferred/terrainF.glsl

...a/newview/app_settings/shaders/class1/deferred/treeF.glsl

.../newview/app_settings/shaders/class1/deferred/waterF.glsl

indra/newview/app_settings/shaders/class1/objects/bumpF.glsl

indra/newview/llviewershadermgr.cpp