[dwm] dmenu history patch

Hi,

small update. Specify the history file with the '-hist <file>'
commandline switch in order to handle multiple dmenu contexts
correctly.

The history size is still static and can be changed in dmenu.h (see
HIST_SIZE).

Patch : http://gotmor.googlepages.com/dmenu-1.4-history.diff
Archive: http://gotmor.googlepages.com/dmenu-history.tar.bz2

Greets, Rob

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