Fix libvncserver-config for in-place operation

Since quite some time, the linkable libraries are stored in the .libs/
subdirectories.  Adjust libvncserver-config to account for that when
running without installing.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

libvncserver-config.in

@@ -11,7 +11,7 @@ if [ -f "`dirname "$0"`/libvncserver-config.in" ]; then
   dir="`dirname "$0"`"
   prefix="`cd "$dir"; pwd`"
   includedir="$prefix"
-  libdir="$prefix/libvncserver $prefix/libvncclient"
+  libdir="$prefix/libvncserver/.libs $prefix/libvncclient/.libs"
 fi
 
 usage="\