scripts: use generic urls for sourceforge

For expat, duma, and strace, use the generic url and 302 to the mirror
instead of trying to download a file from a downed mirror and
failing.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
Message-Id: <b69ebeb72fef93c04c84.1345364051@flambe.is-a-geek.org>
(transplanted from cb75966698d7e44bc76445d7b249eba89bdf1d8a)

# Default test suite configuration

# Default DejaGnu configuration

DG_TOOLNAME = gcc

DG_TARGET_HOSTNAME = 127.0.0.1

DG_TARGET_USERNAME = root

# Default tests

DG_C_TESTS = 

DG_CPP_TESTS =