[package] add ISC DHCP4 4.2.3-P1

Patch from Oliver Smith

git-svn-id: svn://svn.openwrt.org/openwrt/packages@31185 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/dhcp4/patches/001-bind-exports-fix-make.patch

@@ -0,0 +1,28 @@
+--- a/bind/Makefile	2011-11-28 23:08:15.000000000 +0000
++++ b/bind/Makefile	2011-12-17 16:27:20.784433502 +0000
+@@ -49,13 +49,16 @@
+ 
+ # Build the export libraries
+ 	@echo Building BIND Export libraries - this takes some time.
++	@(cd ${bindsrcdir}/lib/export/dns ; \
++	  echo building gen using ${BUILD_CC} in `pwd` ; \
++	  $(MAKE) CC=${BUILD_CC} CFLAGS="-O2" LIBS="" gen)
+ 	@(cd ${bindsrcdir}/lib/export ; \
+ 	  echo building in `pwd` ; \
+ 	  MAKE=${GMAKE} ${GMAKE} > ${binddir}/build.log)
+ 
+ 	@echo Installing BIND Export libraries to ${binddir}.
+ 	@(cd ${bindsrcdir}/lib/export ; \
+-	  MAKE=${GMAKE} ${GMAKE} install > ${binddir}/install.log)
++	  $(MAKE) DESTDIR="" install > ${binddir}/install.log)
+ 
+ clean:
+ 	@echo Cleaning BIND export library.
+@@ -64,6 +67,7 @@
+ 
+ # Include the following so that this Makefile is happy when the parent
+ # tries to use them.
++install-exec:
+ 
+ distdir:
+