fix crash on x86_64 without -O2
Project superseded by https://sourceforge.net/projects/remmina/
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erickwoods
If you build with "CFLAGS=-g" (and no -O2) on x86_64, tsclient will crash when you try to open the connection editor window, because the callback being used has totally the wrong prototype (including a return value when it shouldn't, and using varargs instead of specify all of its parameters).
fix