Makefile: remove /usr/lib/rpm directory on target

this directory is used by the rpm package manager, and packages
like systemd will install "macros" for this system.

It should be deleted just like the similar
/usr/share/aclocal directory from Autoconf.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

Makefile

@@ -732,7 +732,7 @@ target-finalize: $(PACKAGES) $(TARGET_DIR) host-finalize
 	rm -rf $(TARGET_DIR)/usr/include $(TARGET_DIR)/usr/share/aclocal \
 		$(TARGET_DIR)/usr/lib/pkgconfig $(TARGET_DIR)/usr/share/pkgconfig \
 		$(TARGET_DIR)/usr/lib/cmake $(TARGET_DIR)/usr/share/cmake \
-		$(TARGET_DIR)/usr/doc
+		$(TARGET_DIR)/usr/lib/rpm $(TARGET_DIR)/usr/doc
 	find $(TARGET_DIR)/usr/{lib,share}/ -name '*.cmake' -print0 | xargs -0 rm -f
 	find $(TARGET_DIR)/lib/ $(TARGET_DIR)/usr/lib/ $(TARGET_DIR)/usr/libexec/ \
 		\( -name '*.a' -o -name '*.la' -o -name '*.prl' \) -print0 | xargs -0 rm -f