imagemagick: don't create useless debugging file

For some reason, the imagemagick Buildroot .mk file creates a
"datefile" file in the Buildroot source directory, probably an ancient
debugging thing that has been left here for no reason. Let's get rid
of it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/imagemagick/imagemagick.mk

@@ -88,7 +88,6 @@ $(IMAGEMAGICK_DIR)/.libinstall: $(IMAGEMAGICK_LIB)
 	touch $@
 
 $(TARGET_DIR)/usr/bin/animate: $(IMAGEMAGICK_LIB)
-	ls -l $(IMAGEMAGICK_LIB) >> datefile
 	$(IMAGEMAGICK_COPY) $(STAGING_DIR)/usr/bin/$(GNU_TARGET_NAME)-animate $(TARGET_DIR)/usr/bin/animate
 	-$(STRIPCMD) $(STRIP_STRIP_UNNEEDED) $(TARGET_DIR)/usr/bin/animate
 	touch $@