schema/Makefile: Add .PHONY declarations for phony targets

The only non-phony target (where the target name matches the output
file) is 'validate', but we need .PHONY there because the Go
dependencies are not represented in the Makefile.  This commit adds
the missing .PHONY declarations to the other targets, which truly are
phony.

Signed-off-by: W. Trevor King <wking@tremily.us>

Author: wking

schema/Makefile

@@ -1,13 +1,16 @@
 
+.PHONY: default
 default: validate
 
+.PHONY: help
 help:
 	@echo "Usage: make [target]"
 	@echo
 	@echo " * 'fmt' - format the json with indentation"
 	@echo " * 'help' - show this help information"
 	@echo " * 'validate' - build the validation tool"
 
+.PHONY: fmt
 fmt:
 	for i in *.json ; do jq --indent 4 -M . "$${i}" > xx && cat xx > "$${i}" && rm xx ; done
 
@@ -16,6 +19,6 @@ validate: validate.go
 	go get -d ./...
 	go build ./validate.go
 
+.PHONY: clean
 clean:
 	rm -f validate
-