refactor: filter values in environment variables

Before this change, you had to specify custom LD_* variables using the
prefix GAME_LD_*. Now instead of dropping all LD_* variables by default,
we should just filter them and remove the values we *know* are from our
start script.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

launcher/java/JavaUtils.h

@@ -24,6 +24,7 @@
 #include <windows.h>
 #endif
 
+QString stripVariableEntries(QString name, QString target, QString remove);
 QProcessEnvironment CleanEnviroment();
 
 class JavaUtils : public QObject