lesstif: remove host/usr reference from .mk comment

While we're at it, correct it to $(HOST_DIR).

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lesstif/lesstif.mk

@@ -31,7 +31,7 @@ define LESSTIF_NOMAN2HTML
 endef
 
 # Prevents to copy ac_find_motif.m4 on target, it would else
-# be created at $(TARGET_DIR)/$(TOPDIR)/output/host/usr/share/aclocal/ac_find_motif.m4
+# be created at $(TARGET_DIR)/$(HOST_DIR)/share/aclocal/ac_find_motif.m4
 define LESSTIF_FIXACLOCAL
 	sed -i -e "/install-data-am: install-aclocalDATA/d" $(@D)/scripts/autoconf/Makefile
 endef