package/dhcp: install shared libraries

We don't use "make install" for target installation because we build all
utilities (server, relay, client) but install only the selected ones.

The utilities, however, require the shared libraries to work, so use the
"install-exec" make target to install them. This also installs static
libraries but they are removed later by target-finalize.

With this change the omshell utility is installed if server is selected.
We keep it, since it is small and may be useful at run-time.

Fixes:
  https://bugs.busybox.net/show_bug.cgi?id=12086

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/dhcp/dhcp.mk

@@ -40,7 +40,15 @@ ifeq ($(BR2_PACKAGE_DHCP_SERVER_DELAYED_ACK),y)
 DHCP_CONF_OPTS += --enable-delayed-ack
 endif
 
+define DHCP_INSTALL_LIBS
+	$(MAKE) -C $(@D)/common install-exec DESTDIR=$(TARGET_DIR)
+	$(MAKE) -C $(@D)/omapip install-exec DESTDIR=$(TARGET_DIR)
+endef
+
 ifeq ($(BR2_PACKAGE_DHCP_SERVER),y)
+define DHCP_INSTALL_CTL_LIBS
+	$(MAKE) -C $(@D)/dhcpctl install-exec DESTDIR=$(TARGET_DIR)
+endef
 define DHCP_INSTALL_SERVER
 	mkdir -p $(TARGET_DIR)/var/lib
 	(cd $(TARGET_DIR)/var/lib; ln -snf /tmp dhcp)
@@ -99,6 +107,8 @@ endef
 endif
 
 define DHCP_INSTALL_TARGET_CMDS
+	$(DHCP_INSTALL_LIBS)
+	$(DHCP_INSTALL_CTL_LIBS)
 	$(DHCP_INSTALL_RELAY)
 	$(DHCP_INSTALL_SERVER)
 	$(DHCP_INSTALL_CLIENT)