rsync: enable selecting bundled or system zlib

rsync, by default, includes a patched zlib within its source tarball. The patch
enables a better compression ratio for rsync streams. However, the client and
server need the same featureset in their zlib in order to understand the
compression stream, or the server will abort the transfer. Older versions have
no understanding of the new compression standard used.

This patch allows the builder to choose whether to use the bundled or system
zlib. It defautls to using the system zlib, as is the default before this
patch.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

net/rsync/Makefile

@@ -29,7 +29,7 @@ define Package/rsync
   CATEGORY:=Network
   SUBMENU:=File Transfer
   TITLE:=Fast remote file copy program (like rcp)
-  DEPENDS:=+libpopt +zlib +RSYNC_xattr:libattr +RSYNC_acl:libacl
+  DEPENDS:=+libpopt +RSYNC_xattr:libattr +RSYNC_acl:libacl +RSYNC_zlib:zlib
   URL:=http://rsync.samba.org/
   MENU:=1
 endef
@@ -38,6 +38,11 @@ define Package/rsync/config
 	source "$(SOURCE)/Config.in"
 endef
 
+CONFIGURE_ARGS += \
+	--with-included-popt=no \
+	--disable-debug \
+	--disable-locale \
+
 ifeq ($(CONFIG_RSYNC_xattr),y)
 	CONFIGURE_ARGS+= --enable-xattr-support
 else
@@ -50,6 +55,12 @@ else
 	CONFIGURE_ARGS+= --disable-acl-support
 endif
 
+ifeq ($(CONFIG_RSYNC_zlib),y)
+	CONFIGURE_ARGS+= --with-included-zlib=no
+else
+	CONFIGURE_ARGS+= --with-included-zlib=yes
+endif
+
 define Package/rsyncd
   SECTION:=net
   CATEGORY:=Network
@@ -69,12 +80,6 @@ define Package/rsync/description
  between two sets of files across the network link.
 endef
 
-CONFIGURE_ARGS += \
-	--with-included-popt=no \
-	--with-included-zlib=no \
-	--disable-debug \
-	--disable-locale \
-
 define Package/rsync/install
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/$(PKG_NAME) $(1)/usr/bin/