Merge. Refresh from viewer-release.

indra/llmessage/llurlrequest.cpp

indra/llmessage/tests/llhttpclient_test.cpp

indra/llprimitive/CMakeLists.txt

indra/llprimitive/llmaterial.cpp

indra/llprimitive/llmaterial.h

indra/llprimitive/llmaterialid.cpp

indra/llprimitive/llmaterialid.h

indra/llprimitive/llprimitive.cpp

indra/llprimitive/llprimitive.h

indra/llprimitive/llprimtexturelist.cpp

indra/llprimitive/llprimtexturelist.h

indra/llprimitive/lltextureentry.cpp

indra/llprimitive/lltextureentry.h

indra/llrender/CMakeLists.txt

indra/llrender/llgl.cpp

indra/llrender/llgl.h

indra/llrender/llglheaders.h

indra/llrender/llglslshader.cpp

indra/llrender/llglslshader.h

indra/llrender/llimagegl.cpp