re-enable zlib and use it in kexec (issue #170)

modules/kexec

@@ -11,17 +11,15 @@ kexec_configure := ./configure \
 	STRIP="$(CROSS)strip" \
 	--host i386-elf-linux \
 	--target x86_64 \
-	--prefix="$(INSTALL)" \
-	--without-zlib \
+	--prefix="/" \
 	--without-lzma \
 	&& $(MAKE) clean
 
 kexec_target := \
 	$(MAKE_JOBS) \
+	DESTDIR="$(INSTALL)" \
 	install \
 
 kexec_output := build/sbin/kexec
 
-# if we don't need zlib, don't built it
-#kexec_depends := zlib
-kexec_depends := $(musl_dep)
+kexec_depends := zlib $(musl_dep)

modules/zlib

@@ -0,0 +1,21 @@
+modules-y += zlib
+
+zlib_version := 1.2.11
+zlib_dir := zlib-$(zlib_version)
+zlib_tar := zlib-$(zlib_version).tar.gz
+zlib_url := http://www.zlib.net/$(zlib_tar)
+zlib_hash := c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
+
+zlib_configure := \
+	CC="$(heads_cc)" \
+	./configure \
+	--prefix="/" \
+
+zlib_target := \
+	$(MAKE_JOBS) \
+	DESTDIR="$(INSTALL)" \
+	install \
+
+zlib_libraries := libz.so.1
+
+zlib_depends := $(musl_dep)