Remove viewer build dependency on Incredibuild.

Specifically, change the 'BuildConsole' command to 'devenv', and fix
command-line arguments appropriately.

autobuild.xml

@@ -2727,11 +2727,11 @@
                   <string>SecondLife.sln</string>
                 </array>
                 <key>command</key>
-                <string>BuildConsole</string>
+                <string>devenv</string>
                 <key>options</key>
                 <array>
                   <string>/build</string>
-                  <string>"/cfg=RelWithDebInfo|Win32"</string>
+                  <string>"RelWithDebInfo|Win32"</string>
                 </array>
               </map>
               <key>configure</key>
@@ -2815,11 +2815,11 @@
                   <string>SecondLife.sln</string>
                 </array>
                 <key>command</key>
-                <string>BuildConsole</string>
+                <string>devenv</string>
                 <key>options</key>
                 <array>
                   <string>/build</string>
-                  <string>"/cfg=Release|Win32"</string>
+                  <string>"Release|Win32"</string>
                 </array>
               </map>
               <key>configure</key>