enable-wx-debug option for configure is not working

[Christian Beer]

I tried to use the enable-wx-debug option in order to debug a manager problem I found out that ./configure --enable-wx-debug was not working. I pinpointed the problem in a m4 script which generates the faulty code in configure. Attached is a patch that allows for proper use of --enable-wx-debug again.

Another thing I found is that clientgui/res/Makefile is not deleted when running make distclean. There seems to be a recursive call missing in clientgui/Makefile. I don't know enough about makefiles to fix this too.