Add wmlib folder back

It was removed on 67a8a82670 with the assumption that
nothing was using it. But that was not really the case - FSViewer
used it.

I've just tested it. After a trivial fix regarding the change in
the function definition of WMWritePropListToFile(), FSViewer
compiles and even seems to work (didn't test much though).

So let's not be unfair with FSViewer and put wmlib back. FSViewer
might even be used for educational purposes for people wanting to
write apps using WINGs etc.

configure.ac

@@ -636,6 +636,9 @@ if test "$xpm" = yes; then
     fi
 fi
 
+# for wmlib
+AC_SUBST(XCFLAGS)
+# for test
 AC_SUBST(XLFLAGS)
 AC_SUBST(XLIBS)
 AC_SUBST(X_EXTRA_LIBS)
@@ -862,11 +865,11 @@ fi
 
 gl_LD_VERSION_SCRIPT
 
-AC_OUTPUT(Makefile po/Makefile util/Makefile util/po/Makefile \
+AC_OUTPUT(Makefile po/Makefile util/Makefile util/po/Makefile test/Makefile \
 	WINGs/Makefile WINGs/WINGs/Makefile WINGs/Documentation/Makefile \
 	WINGs/Examples/Makefile WINGs/Resources/Makefile WINGs/Tests/Makefile \
 	WINGs/Extras/Makefile WINGs/po/Makefile \
-	wrlib/Makefile wrlib/tests/Makefile \
+	wmlib/Makefile wrlib/Makefile wrlib/tests/Makefile \
 	src/Makefile src/wconfig.h \
 	doc/Makefile doc/sk/Makefile doc/cs/Makefile \
 	doc/ru/Makefile \