pkg-infra: move the svn download helper to a script

Maintaining the download helpers in the Makefile has proved to be a bit
complex, so move it to a shell script.

[Peter: redirect pushd/popd output to /dev/null]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Ryan Barnett <ryan.barnett@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/package/pkg-download.mk b/package/pkg-download.mk
index c848f6a..e823f68 100644
--- a/package/pkg-download.mk
+++ b/package/pkg-download.mk
@@ -9,7 +9,7 @@
 
 # Download method commands
 WGET := $(call qstrip,$(BR2_WGET)) $(QUIET)
-SVN := $(call qstrip,$(BR2_SVN))
+export SVN := $(call qstrip,$(BR2_SVN))
 CVS := $(call qstrip,$(BR2_CVS))
 BZR := $(call qstrip,$(BR2_BZR))
 export GIT := $(call qstrip,$(BR2_GIT))
@@ -133,11 +133,8 @@
 
 define DOWNLOAD_SVN
 	test -e $(DL_DIR)/$($(PKG)_SOURCE) || \
-	(pushd $(DL_DIR) > /dev/null && \
-	$(SVN) export $($(PKG)_SITE)@$($(PKG)_DL_VERSION) $($(PKG)_DL_DIR) && \
-	$(TAR) czf $($(PKG)_SOURCE) $($(PKG)_BASE_NAME)/ && \
-	rm -rf $($(PKG)_DL_DIR) && \
-	popd > /dev/null)
+	$(EXTRA_ENV) support/download/svn $($(PKG)_SITE) $($(PKG)_DL_VERSION) \
+					  $($(PKG)_BASE_NAME) $(DL_DIR)/$($(PKG)_SOURCE)
 endef
 
 define SOURCE_CHECK_SVN