explicitly enable INSTALL_PROPRIETARY in the Linden configurations

autobuild.xml

@@ -1592,6 +1592,7 @@
                   <string>-DCMAKE_BUILD_TYPE:STRING=Debug</string>
                   <string>-DWORD_SIZE:STRING=32</string>
                   <string>-DROOT_PROJECT_NAME:STRING=SecondLife</string>
+                  <string>-DINSTALL_PROPRIETARY=TRUE</string>
                 </array>
               </map>
               <key>name</key>
@@ -1632,6 +1633,7 @@
                   <string>-DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo</string>
                   <string>-DWORD_SIZE:STRING=32</string>
                   <string>-DROOT_PROJECT_NAME:STRING=SecondLife</string>
+                  <string>-DINSTALL_PROPRIETARY=TRUE</string>
                 </array>
               </map>
               <key>name</key>
@@ -1674,6 +1676,7 @@
                   <string>-DROOT_PROJECT_NAME:STRING=SecondLife</string>
                   <string>-DUSE_PRECOMPILED_HEADERS=ON</string>
                   <string>-DLL_RELEASE_FOR_DOWNLOAD:BOOL=TRUE</string>
+                  <string>-DINSTALL_PROPRIETARY=TRUE</string>
                 </array>
               </map>
               <key>name</key>