Deferred has sky and water textures now. Underwater is still borked.

Deferred fastalpha behaves a bit better.
Pulled over patch for https://jira.secondlife.com/browse/STORM-336 and https://jira.secondlife.com/browse/STORM-1011 from linden repo
Sky rendered using new LL method. Assuming this fixes issues on AMD cards(works on cat 11.2)
Added a few things missed related to spatial-parition updating.
Added 'SkipReflectOcclusionUpdates' setting that prevents occlusion updates for reflection pass. Less taxing on CPU.

indra/newview/app_settings/settings.xml

@@ -9843,6 +9843,17 @@
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>RenderVBOMappingDisable</key>
+    <map>
+      <key>Comment</key>
+      <string>Disable VBO glMapBufferARB</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
     <key>RenderVolumeLODFactor</key>
     <map>
       <key>Comment</key>
@@ -12800,6 +12811,17 @@
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>SkipReflectOcclusionUpdates</key>
+    <map>
+      <key>Comment</key>
+      <string>Enable optimization that prevents occlusion updates for refelction pass</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
     <key>UseOutfitFolders</key>
     <map>
       <key>Comment</key>