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/llcommon/llstring.h

@@ -36,6 +36,7 @@
 #include <string>
 #include <cstdio>
 #include <algorithm>
+#include <map>
 
 #if LL_LINUX || LL_SOLARIS
 #include <wctype.h>