[Bugfix] Link vncviewer.exe against common/os/libos.la.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4209 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/win/vncviewer/Makefile.am b/win/vncviewer/Makefile.am
index d618738..b11dfa1 100644
--- a/win/vncviewer/Makefile.am
+++ b/win/vncviewer/Makefile.am
@@ -37,6 +37,7 @@
     $(top_builddir)/common/Xregion/libXregion.la \
     $(top_builddir)/common/network/libnetwork.la \
     $(top_builddir)/common/rdr/librdr.la \
+    $(top_builddir)/common/os/libos.la \
     resources.o -lws2_32 -lgdi32 -luser32 -lcomctl32 -lversion -lcomdlg32
 
 vncviewer_LDFLAGS = -I$(top_srcdir)/win -mwindows