Fetching from urls: Error Message (#16434)

* Fetching from urls: Error Message

Fix the error message when fetching from consecutive `urls` of a
package version. Each fail should show the currently failing URL,
not the first url.

Example multi-problem run that occured in real life:
```
==> 5821: Installing util-macros
curl: (28) Connection timed out after 10000 milliseconds
curl: (16) Error in the HTTP2 framing layer
curl: (22) The requested URL returned error: 403 Forbidden
==> Fetching https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2
==> Failed to fetch file from URL: https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2
    Curl failed with error 28
==> Fetching https://mirrors.ircam.fr/pub/x.org/individual/util/util-macros-1.19.1.tar.bz2
==> Failed to fetch file from URL: https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2
    Curl failed with error 16
==> Fetching http://xorg.mirrors.pair.com/individual/util/util-macros-1.19.1.tar.bz2
==> Failed to fetch file from URL: https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2
    URL https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2 was not found!
==> Fetching from https://www.x.org/archive/individual/util/util-macros-1.19.1.tar.bz2 failed.
==> Error: FetchError: All fetchers failed for spack-stage-util-macros-1.19.1-se2a2e74oyusj2r4esgcb7pr3qhh45ef
```

- `urls[0]`: HTTP2 layer error
- `urls[1]`: timeout
- `urls[2]`: missing file on mirror

* x.org: two more mirrors

x.org mirrors are a bit tricky, since many are out-of-sync or off.
A good package to test with is `util-macros`, which had a "recent"
release.

0 files changed, 0 insertions, 0 deletions