build: Update "make show_targets" output

The output of "make show_targets" didn't show all targets! Update it for
all the recent targets that were forgotten.

Author: mpe

build/Makefile

@@ -145,7 +145,7 @@ push-images: ${PUSH_IMAGES}
 pull-base-images: ${PULL_BASE_IMAGES}
 docs: ${DOCS}
 
-ALL_TARGETS = ${KERNEL} ${PPCTESTS} ${SELFTESTS} ${IMAGES} ${PULL_IMAGES} ${DOCS} ${CLEAN}
+ALL_TARGETS = ${KERNEL} ${PPCTESTS} ${SELFTESTS} ${PERF} ${IMAGES} ${PULL_IMAGES} ${REBUILD_IMAGES} ${PUSH_IMAGES} ${PULL_BASE_IMAGES} ${DOCS} ${CLEAN}
 .PHONY: ${ALL_TARGETS} VERSION
 
 empty:=