Makefiles: remove @true

Apparently @true was used as a rule for any target which should have
a non-empty rule doing nothing. For this, there's a "<target>: ;"
syntax, let's use this and eliminate an unnecessary fork/exec :)
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Makefile

@@ -311,8 +311,7 @@ endif
 tar-name := $(shell echo $(head-name) | sed -e 's/^v//g')
 criu-$(tar-name).tar.bz2:
 	git archive --format tar --prefix 'criu-$(tar-name)/' $(head-name) | bzip2 > $@
-dist tar: criu-$(tar-name).tar.bz2
-	@true
+dist tar: criu-$(tar-name).tar.bz2 ;
 .PHONY: dist tar
 
 tags:

Makefile.install

@@ -41,8 +41,7 @@ install-compel: $(compel-install-targets)
 	$(Q) $(MAKE) $(build)=compel/plugins install
 .PHONY: install-compel
 
-install: install-man install-lib install-criu install-compel
-	@true
+install: install-man install-lib install-criu install-compel ;
 .PHONY: install
 
 uninstall:

criu/Makefile

@@ -57,8 +57,7 @@ pie: criu/pie/pie.lib.a
 	$(Q) $(MAKE) $(build)=criu/pie all
 .PHONY: pie
 
-criu/pie/%: pie
-	@true
+criu/pie/%: pie ;
 
 #
 # CRIU executable

scripts/nmk/Makefile

@@ -29,8 +29,7 @@ install:
 	@cp scripts/tools.mk $(dir)
 	@cp scripts/utils.mk $(dir)
 
-all:
-	@true
+all: ;
 
 clean:
 	$(call msg-clean, "nmk")

scripts/nmk/scripts/build.mk

@@ -281,8 +281,7 @@ endif
 
 #
 # Main phony rule.
-all: $(all-y)
-	@true
+all: $(all-y) ;
 .PHONY: all
 
 #