[dwm] dmenu history patch

Hi,

small patch against dmenu-1.4 to provide a history.

Define the history file (HIST_FILE) and history size (HIST_SIZE) in
dmenu.h.

An archive with the patch applied can be found here:
http://gotmor.googlepages.com/dmenu-history.tar.bz2

Patch file attached to this message.

Greets, Rob

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