Make viewer compile on standalone linux x86_64

This involves making libllcommon shared, a change
that was not finished for windows/Mac.
More changes are needed to indra/newview/viewer_manifest.py
for those two operating systems, as well as to
indra/copy_win_scripts.

I did not test this on linux 32bit, nor non-standalone
on that OS, either.

I did not check voice (which will very likely not work
anyway on 64bit). And currently the webkit plugin doesn't
work for me, but I'll fix that in a different commit.

indra/media_plugins/example/CMakeLists.txt

@@ -79,4 +79,4 @@ if (DARWIN)
     LINK_FLAGS "-exported_symbols_list ${CMAKE_CURRENT_SOURCE_DIR}/../base/media_plugin_base.exp"
   )
 
-endif (DARWIN)
+endif (DARWIN)