[DM-dev] BugFix: "Version 1.0 does not compile"

[Henningsen <al...@gl...>]

On some systems, DungeonMaker 1.0 does not compile, with the compiler
complaining that 

"strlen undeclared".

This can be fixed by adding the line

#include <string.h>

at the top of the .cpp-file with the other includes.

Peter Henningsen