test-fetch: fix non-portable sed regex.
(s/...\+/.../ appears to be a GNU-ism: this test broke on OS X and
NetBSD. Changing \+ to * fixes it, although that is a slightly less
strict regex.)
#!/bin/sh
# Testing that hghave does not crash when checking features
"$TESTDIR/hghave" --test-features 2>/dev/null