Travis: download moreutils from the release tarball (JuliaLang#26902)

* Update moreutils git repo location in .travis.yml

The old `kitenet.net` domain is down.  Checking on wayback, its pages had been throwing 302 redirects to this new domain.

* Try downloading tarball from http.debian.net

[av skip]

.travis.yml

@@ -104,7 +104,8 @@ before_install:
  export JULIA_TEST_MAXRSS_MB=600;
  TESTSTORUN="all --skip linalg/triangular subarray"; fi # TODO: re enable these if possible without timing out
  - echo "override JULIA_CPU_TARGET=generic;native" >> Make.user
- - git clone -q git:https://git.kitenet.net/moreutils
+ - wget http:https://http.debian.net/debian/pool/main/m/moreutils/moreutils_0.62.orig.tar.xz
+ - tar -xJvf moreutils_0.62.orig.tar.xz && mv moreutils-0.62 moreutils
 script:
  - echo BUILDOPTS=$BUILDOPTS
  - export BUILDOPTS