Another fix to the cration of .lib symlinks.

ChangeLog

+2012-03-30  Niels Möller  <nisse@lysator.liu.se>
+
+	* Makefile.in (soname link): Fixed logic.
+
 2012-03-29  Niels Möller  <nisse@lysator.liu.se>
 
 	Implementation of Salsa20, contributed by Simon Josefsson.

Makefile.in

@@ -177,7 +177,7 @@ $(LIBNETTLE_FORLINK): $(nettle_PURE_OBJS)
 	(cd .lib \
           && rm -f $(LIBNETTLE_FORLINK) \
 	  && $(LN_S) ../$(LIBNETTLE_FORLINK) $(LIBNETTLE_FORLINK) \
-	  && [ -n "$(LIBNETTLE_SONAME)" ] \
+	  && [ -z "$(LIBNETTLE_SONAME)" ] \
 	  || { rm -f $(LIBNETTLE_SONAME) \
 	       && $(LN_S) $(LIBNETTLE_FORLINK) $(LIBNETTLE_SONAME) ; } )
 
@@ -187,7 +187,7 @@ $(LIBHOGWEED_FORLINK): $(hogweed_PURE_OBJS) $(LIBNETTLE_FORLINK)
 	(cd .lib \
           && rm -f $(LIBHOGWEED_FORLINK) \
 	  && $(LN_S) ../$(LIBHOGWEED_FORLINK) $(LIBHOGWEED_FORLINK) \
-	  && [ -n "$(LIBHOGWEED_SONAME)" ] \
+	  && [ -z "$(LIBHOGWEED_SONAME)" ] \
 	  || { rm -f $(LIBHOGWEED_SONAME) \
 	       && $(LN_S) $(LIBHOGWEED_FORLINK) $(LIBHOGWEED_SONAME) ; } )