tools: bpftool: declare phony targets as such

In the Makefile, targets install, doc and doc-install should be added to
.PHONY. Let's fix this.

Fixes: 71bb428 ("tools: bpf: add bpftool")
Signed-off-by: Quentin Monnet <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>

Author: qmonnet

tools/bpf/bpftool/Makefile

@@ -89,5 +89,5 @@ doc-install:
 
 FORCE:
 
-.PHONY: all clean FORCE
+.PHONY: all clean FORCE install doc doc-install
 .DEFAULT_GOAL := all