Fix broken link. While at it, use $(SZIP_VERSION) inside SZIP_SITE instead of duplicating the version. Fixes: http://autobuild.buildroot.org/results/35d/35d08103bbd0da22a5e111f1f86f28aba7062ee6 Signed-off-by: Waldemar Brodkorb <wbx@openadk.org> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>