build: remove unnecessary distclean targets

This also fixes the duplicate execution of the "clean" targets.

Makefile

@@ -184,10 +184,6 @@ clean:
 
 .PHONY: distclean
 distclean: clean
-	for dir in $$(dirname $(ALL_ITEMS)) $(MYDIRS); do \
-		$(MAKE) -C $$dir distclean; \
-	done
-	$(MAKE) -C test distclean
 	rm -fr autom4te.cache config.log config.mk config.sh config.status
 
 .PHONY: realinstall

src/bash_completion/Makefile

@@ -13,6 +13,3 @@ firejail.bash_completion: firejail.bash_completion.in $(ROOT)/config.mk
 .PHONY: clean
 clean:
 	rm -fr firejail.bash_completion
-
-.PHONY: distclean
-distclean: clean

src/prog.mk

@@ -20,6 +20,3 @@ $(PROG): $(OBJS) $(ROOT)/config.mk
 
 .PHONY: clean
 clean:; rm -fr $(PROG) $(CLEANFILES)
-
-.PHONY: distclean
-distclean: clean

src/so.mk

@@ -20,6 +20,3 @@ $(SO): $(OBJS) $(ROOT)/config.mk
 
 .PHONY: clean
 clean:; rm -fr $(SO) $(CLEANFILES)
-
-.PHONY: distclean
-distclean: clean

src/zsh_completion/Makefile

@@ -13,6 +13,3 @@ _firejail: _firejail.in $(ROOT)/config.mk
 .PHONY: clean
 clean:
 	rm -fr _firejail
-
-.PHONY: distclean
-distclean: clean

test/Makefile

@@ -12,6 +12,3 @@ $(TESTS):
 .PHONY: clean
 clean:
 	for test in $(TESTS); do rm -f "$$test/$$test.log"; done
-
-.PHONY: distclean
-distclean: clean