tools: scons: Add alternate download URL
sourceforge.net sometimes produces the following tarball file while
being behind a HTTP proxy:
We're sorry -- the Sourceforge site is currently in Disaster Recovery
mode, and currently requires
the use of javascript to function. Please check back later.
Update to a regular FTP location that allows us to complete the
download.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47244
3c298f89-4303-0410-b956-
a3cf2f4a3e73