Revert handling of space in filenames.

lfs/Config

@@ -136,14 +136,12 @@ define POSTBUILD
 			echo "error $$LFS_SCRIPT not found in config/rootfiles"; \
 		fi; \
 		sed "s/KVER/$(KVER)/g" $$ROOTFILE > $(TARGET)_rootfile; \
-		IFS=`echo`; \
 		for line in `cat $(TARGET)_diff`; do \
 			if grep -qG "^#$$line$$" $(TARGET)_rootfile; then echo "#$$line" >> $(TARGET); \
 			elif grep -qG "^$$line$$" $(TARGET)_rootfile ; then echo "$$line" >> $(TARGET); \
 			else echo "+$$line" >> $(TARGET); \
 			fi; \
 		done; \
-		unset IFS; \
 		rm -f $(TARGET)_rootfile; \
 	else \
 		touch $(TARGET); \