build: Remove unused upx makefile stuff (#291)

Author: jimmidyson

make/all.mk

@@ -12,7 +12,6 @@ include $(INCLUDE_DIR)go.mk
 include $(INCLUDE_DIR)goreleaser.mk
 include $(INCLUDE_DIR)docker.mk
 include $(INCLUDE_DIR)tag.mk
-include $(INCLUDE_DIR)upx.mk
 include $(INCLUDE_DIR)addons.mk
 include $(INCLUDE_DIR)kind.mk
 include $(INCLUDE_DIR)clusterctl.mk