dhcpcd: use standard installation

Drop the custom/manual install cmds and do a normal make install.
This gets dhcpcd-hooks installed which are useful for many accesory
setup functions like dns, ntp server, and so on.
Also install dhcpcd to /sbin since it's expected by debian ifupdown,
For busybox ifupdown when external dhcp clients are enabled (not in the
default config we ship) will search the path.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dhcpcd/dhcpcd.mk

@@ -35,12 +35,7 @@ define DHCPCD_BUILD_CMDS
 endef
 
 define DHCPCD_INSTALL_TARGET_CMDS
-	$(INSTALL) -D -m 0755 $(@D)/dhcpcd \
-		$(TARGET_DIR)/usr/sbin/dhcpcd
-	$(INSTALL) -D -m 0644 $(@D)/dhcpcd.conf \
-		$(TARGET_DIR)/etc/dhcpcd.conf
-	$(INSTALL) -D -m 0755 $(@D)/dhcpcd-run-hooks \
-		$(TARGET_DIR)/libexec/dhcpcd-run-hooks
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) install DESTDIR=$(TARGET_DIR)
 endef
 
 # NOTE: Even though this package has a configure script, it is not generated