package/dhcp: fix install of internal bind libraries

Internal bind libraries are not installed to target since commit
0c8dd6ebd656e06cf99a63eb93343715f4853503 resulting in the following
runtime failure:

Starting DHCP server: /usr/sbin/dhcpd: error while loading shared libraries: libirs.so.161: cannot open shared object file: No such file or directory

RANLIB must also be set to avoid the following build failure at install
step:

libtool: install: arceb-buildroot-linux-uclibc-ranlib /home/fabrice/buildroot/output/per-package/dhcp/target/usr/lib/libisccfg.a
/home/fabrice/buildroot/output/build/dhcp-4.4.3/bind/bind-9.11.36/libtool: line 1719: arceb-buildroot-linux-uclibc-ranlib: command not found

Fixes:
 - No autobuilder failures (reported by Eugen.Hristev@microchip.com)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 2087051d3724c66064c1df8d379727b0b4d30a92)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dhcp/dhcp.mk

@@ -28,7 +28,8 @@ DHCP_BIND_EXTRA_CONFIG = \
 	BUILD_CC='$(HOSTCC)' \
 	BUILD_CFLAGS='$(HOST_CFLAGS)' \
 	BUILD_CPPFLAGS='$(HOST_CPPFLAGS)' \
-	BUILD_LDFLAGS='$(HOST_LDFLAGS)'
+	BUILD_LDFLAGS='$(HOST_LDFLAGS)' \
+	RANLIB='$(TARGET_RANLIB)'
 
 DHCP_CONF_ENV += ac_cv_prog_AWK=$(HOST_DIR)/bin/gawk
 
@@ -70,6 +71,7 @@ DHCP_CONF_OPTS += --enable-delayed-ack
 endif
 
 define DHCP_INSTALL_LIBS
+	$(MAKE) -C $(@D)/bind install-bind DESTDIR=$(TARGET_DIR)
 	$(MAKE) -C $(@D)/common install-exec DESTDIR=$(TARGET_DIR)
 	$(MAKE) -C $(@D)/omapip install-exec DESTDIR=$(TARGET_DIR)
 endef