src: Don't use double-colon rules

According to the GNU Make manual, "double-colon rules are
somewhat obscure and not often very useful". Looking at
the few instances we have in libvirt, that certainly seems
to be the case, so just drop them.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

src/Makefile.am

@@ -816,14 +816,14 @@ if WITH_LIBVIRTD
 if LIBVIRT_INIT_SCRIPT_RED_HAT
 initdir = $(sysconfdir)/rc.d/init.d
 
-install-init:: $(SYSVINIT_FILES) install-sysconfig
+install-init: $(SYSVINIT_FILES) install-sysconfig
 	$(MKDIR_P) $(DESTDIR)$(initdir)
 	for f in $(SYSVINIT_FILES:%.init=%) ; \
 	do \
 	  $(INSTALL_SCRIPT) $$f.init $(DESTDIR)$(initdir)/$$f; \
 	done
 
-uninstall-init:: uninstall-sysconfig
+uninstall-init: uninstall-sysconfig
 	rm -f $(SYSVINIT_FILES:%.init=$(DESTDIR)$(initdir)/%)
 	rmdir $(DESTDIR)$(initdir) || :
 
@@ -1010,7 +1010,7 @@ install-data-local: $(INSTALL_DATA_LOCAL) \
 	$(MKDIR_P) "$(DESTDIR)$(localstatedir)/lib/libvirt/filesystems"
 	$(MKDIR_P) "$(DESTDIR)$(localstatedir)/lib/libvirt/boot"
 
-uninstall-local:: $(UNINSTALL_LOCAL) \
+uninstall-local: $(UNINSTALL_LOCAL) \
 		$(INSTALL_DATA_DIRS:%=uninstall-data-%)
 	rmdir "$(DESTDIR)$(localstatedir)/cache/libvirt" ||:
 	rmdir "$(DESTDIR)$(localstatedir)/lib/libvirt/images" ||:

src/remote/Makefile.inc.am

@@ -213,7 +213,7 @@ polkitdir = $(datadir)/polkit-1
 polkitactionsdir = $(polkitdir)/actions
 polkitrulesdir = $(polkitdir)/rules.d
 
-install-polkit::
+install-polkit:
 	$(MKDIR_P) $(DESTDIR)$(polkitactionsdir)
 	$(INSTALL_DATA) $(srcdir)/remote/libvirtd.policy \
 		$(DESTDIR)$(polkitactionsdir)/org.libvirt.unix.policy
@@ -221,7 +221,7 @@ install-polkit::
 	$(INSTALL_DATA) $(srcdir)/remote/libvirtd.rules \
 		$(DESTDIR)$(polkitrulesdir)/50-libvirt.rules
 
-uninstall-polkit::
+uninstall-polkit:
 	rm -f $(DESTDIR)$(polkitactionsdir)/org.libvirt.unix.policy
 	rmdir $(DESTDIR)$(polkitactionsdir) || :
 	rm -f $(DESTDIR)$(polkitrulesdir)/50-libvirt.rules