Add setting to allow legacy UDP offline message fetch till LL fixes the cap.

indra/newview/app_settings/settings_ascent.xml

@@ -3,6 +3,17 @@
 	<map>
 		<!-- Ascent-Specific Settings -->
 
+    <key>RGUseLegacyOfflines</key>
+    <map>
+      <key>Comment</key>
+      <string>Use legacy UDP offline messages retrieval, to avoid missing attachments server bug.  Will be removed when LL fixes the cap.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
     <key>SingularityBoldGroupModerator</key>
     <map>
       <key>Comment</key>

indra/newview/llimprocessing.cpp

@@ -29,6 +29,7 @@
 #include "llimprocessing.h"
 
 #include "hippofloaterxml.h"
+#include "hippogridmanager.h"
 #include "llagent.h"
 #include "llagentui.h"
 #include "llavataractions.h"
@@ -1877,6 +1878,7 @@ void LLIMProcessing::requestOfflineMessages()
         // to build a correct name.  Likewise, inventory offers from
         // muted avatars require the mute list to properly mute.
         if (cap_url.empty()
+            || (gHippoGridManager->getConnectedGrid()->isSecondLife() && gSavedSettings.getBOOL("RGUseLegacyOfflines"))
             || gAgent.getRegionCapability("AcceptFriendship").empty()
             || gAgent.getRegionCapability("AcceptGroupInvite").empty())
         {