split configure args into two environmental variables

[nellshamrell]

Signed-off-by: Nell Shamrell nellshamrell@gmail.com

[rust-highfive]

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[rust-highfive]

Your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2020-03-09T22:50:57.9656240Z Prepare build directory.
2020-03-09T22:50:58.0070934Z Set build variables.
2020-03-09T22:50:58.0108032Z Download all required tasks.
2020-03-09T22:50:58.0243867Z Downloading task: Bash (3.163.1)
2020-03-09T22:50:58.9132643Z Checking job knob settings.
2020-03-09T22:50:58.9154999Z Finished checking job knob settings.
2020-03-09T22:50:58.9752590Z ##[section]Finishing: Initialize job
2020-03-09T22:50:59.0133051Z ##[section]Starting: Configure Job Name
2020-03-09T22:50:59.1327334Z ==============================================================================
2020-03-09T22:50:59.1328234Z Task         : Bash
---
2020-03-09T22:51:00.7893516Z ========================== Starting Command Output ===========================
2020-03-09T22:51:00.7899432Z [command]"C:\Program Files\Git\bin\bash.exe" --noprofile --norc /d/a/_temp/ab5b0663-e9f3-4958-8da0-95eed2dde931.sh
2020-03-09T22:51:00.8908290Z 
2020-03-09T22:51:00.8985574Z ##[section]Finishing: Disable git automatic line ending conversion
2020-03-09T22:51:00.9094538Z ##[section]Starting: Checkout rust-lang/rust@refs/pull/69872/merge to s
2020-03-09T22:51:00.9193822Z Task         : Get sources
2020-03-09T22:51:00.9194126Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
2020-03-09T22:51:00.9194487Z Version      : 1.0.0
2020-03-09T22:51:00.9194682Z Author       : Microsoft
---
2020-03-09T22:51:03.3269064Z ##[command]git remote add origin https://github.com/rust-lang/rust
2020-03-09T22:51:03.4055616Z ##[command]git config gc.auto 0
2020-03-09T22:51:03.4596455Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2020-03-09T22:51:03.4970214Z ##[command]git config --get-all http.proxy
2020-03-09T22:51:03.5409890Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/69872/merge:refs/remotes/pull/69872/merge

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @rust-lang/infra. (Feature Requests)

[nellshamrell]

Closing in favor of #69894