Bug 21313 – TestSuite heisenbug in buildkite/dmd Build

More network heisenbugs. Here's yet another one in buildkite/dmd Build: ``` Preparing working directory | 2s -- | --   | Running commands | 0s   | Print environment | 0s   | Linux ci-agent-be765bef-9cd1-4979-8732-a90a52bd9c0e 4.4.0-135-generic #161-Ubuntu SMP Mon Aug 27 10:45:01 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux   | git version 2.7.4   | GNU Make 4.1   | Built for x86_64-pc-linux-gnu   | Copyright (C) 1988-2014 Free Software Foundation, Inc.   | License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>   | This is free software: you are free to change and redistribute it.   | There is NO WARRANTY, to the extent permitted by law.   | /bin/bash: line 4: --version: command not found   | c++ (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609   | Copyright (C) 2015 Free Software Foundation, Inc.   | This is free software; see the source for copying conditions. There is NO   | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.   |     | GNU gold (GNU Binutils for Ubuntu 2.26.1) 1.11   | GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1   | Copyright (C) 2016 Free Software Foundation, Inc.   | License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>   | This is free software: you are free to change and redistribute it.   | There is NO WARRANTY, to the extent permitted by law. Type "show copying"   | and "show warranty" for details.   | This GDB was configured as "x86_64-linux-gnu".   | Type "show configuration" for configuration details.   | For bug reporting instructions, please see:   | <http://www.gnu.org/software/gdb/bugs/>.   | Find the GDB manual and other documentation resources online at:   | <http://www.gnu.org/software/gdb/documentation/>.   | For help, type "help".   | Type "apropos word" to search for commands related to "word".   | /bin/bash: line 8: dmd: command not found   | warning: failed to remove build/ldc-developers-ldc/bootstrap   | 🚨 Error: The command exited with status 1 ```

@Geod24 created dlang/dmd pull request #11884 "Fix 21313 - Use curl's retry-all-errors option" fixing this issue: - Fix 21313 - Use curl's retry-all-errors option Curl would only retry 400s, 500s, and timeout, not connection closed by peer or other kind of transition connections. Using '--retry-all-errors' fixes this, however care must be put into avoiding the usage of pipes (see manual). Additionally, the total timeout was increased to 5 minutes as requested by Walter, and the connection timeout was also extended to reflect to be more tolerant. https://github.com/dlang/dmd/pull/11884

*** Issue 21262 has been marked as a duplicate of this issue. ***

THIS ISSUE HAS BEEN MOVED TO GITHUB https://github.com/dlang/dmd/issues/19805 DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB