Fix a few broken Trac links [skip ci]

This patch only attempts to fix links that don't automatically re-direct to the correct URL.
22 jobs for master in 352 minutes and 28 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Lint
passed #51868
lint
lint-submods

00:01:47

 
  Build
passed #51870
x86_64-linux
hadrian-ghc-in-ghci

00:09:21

failed #51869
x86_64-linux allowed to fail
validate-x86_64-linux-deb8-hadrian

00:03:26

passed #51871
x86_64-linux
validate-x86_64-linux-deb9-debug

00:55:10

 
  Full Build
failed #51873
aarch64-linux allowed to fail
validate-aarch64-linux-deb9

01:06:16

passed #51874
x86_64-linux
validate-i386-linux-deb9

01:41:02

passed #51872
x86_64-darwin
validate-x86_64-darwin

00:58:21

passed #51875
x86_64-linux
validate-x86_64-linux-deb9

01:46:30

passed #51877
x86_64-linux
validate-x86_64-linux-deb9-integer-simple

01:47:30

passed #51876
x86_64-linux
validate-x86_64-linux-deb9-llvm

02:57:25

passed #51878
x86_64-linux
validate-x86_64-linux-deb9-unreg

03:04:57

passed #51879
x86_64-linux
validate-x86_64-linux-fedora27

01:00:31

failed #51881
x86_64-windows allowed to fail
validate-x86_64-windows

02:23:44

passed #51959
x86_64-windows
validate-x86_64-windows-hadrian

01:44:28

failed #51880
x86_64-windows
validate-x86_64-windows-hadrian

00:00:00

passed #51958
x86_64-windows
validate-x86_64-windows-hadrian

01:32:29

 
  Cleanup
passed #51883
x86_64-darwin
cleanup-darwin

00:00:09

passed #51957
x86_64-windows
cleanup-windows

00:00:28

failed #51882
x86_64-windows
cleanup-windows

00:00:00

 
  Packaging
passed #51884
x86_64-linux
doc-tarball

00:04:48

 
  Hackage
manual #51885
x86_64-linux allowed to fail manual
hackage
 
  Deploy
failed #51886
x86_64-linux
pages

00:00:35

 
Name Stage Failure
failed
validate-x86_64-linux-deb8-hadrian Build
Synchronizing submodule url for 'utils/hsc2hs'
$ git submodule update --init --recursive
Submodule path 'libraries/Cabal': checked out '5d258537b754005d2a1d170b44d764b63ff4fc75'
fatal: Needed a single revision
Unable to find current revision in submodule path 'libraries/Win32'
Uploading artifacts...
WARNING: ghc.tar.xz: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1
failed
pages Deploy
From https://gitlab.haskell.org/ghc/ghc-performance-notes
79d5d84184..06f1b8d691 refs/notes/perf -> refs/notes/perf
$ mkdir -p public/doc
$ tar -xf haddock.html.tar.xz -C public/doc
$ tar -xf libraries.html.tar.xz -C public/doc
$ tar -xf users_guide.html.tar.xz -C public/doc
$ cp -f index.html public/doc
cp: cannot stat 'index.html': No such file or directory
ERROR: Job failed: exit code 1
failed
validate-x86_64-windows Full Build
junit.xml: found 1 matching files                  
WARNING: Failed to load system CertPool: crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=51881 responseStatus=201 Created token=tLrE5KRW
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=7140 revision=7f00c780 version=11.5.1
junit.xml: found 1 matching files

WARNING: Failed to load system CertPool: crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=51881 responseStatus=201 Created token=tLrE5KRW
ERROR: Job failed: exit status 2
failed
validate-aarch64-linux-deb9 Full Build
$ cp -Rf $HOME/.cabal cabal-cache
Uploading artifacts...
WARNING: ghc-*.tar.xz: no matching files
WARNING: junit.xml: no matching files
ERROR: No files to upload
Uploading artifacts...
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1