expat: remove useless post install stripping hook

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

package/expat/expat.mk

@@ -20,7 +20,3 @@ EXPAT_DEPENDENCIES = host-pkg-config
 
 $(eval $(call AUTOTARGETS,package,expat))
 $(eval $(call AUTOTARGETS,package,expat,host))
-
-$(EXPAT_HOOK_POST_INSTALL): $(EXPAT_TARGET_INSTALL_TARGET)
-	$(STRIPCMD) $(STRIP_STRIP_UNNEEDED) $(TARGET_DIR)/usr/lib/libexpat.so.*
-	touch $@