Create RTS configure script that is responsible for ghcautoconf.h and ghcplatform.h

Closed John Ericson requested to merge wip/rts-configure into master

There are still other aspects of the top-level configure script that are RTS specific and ought to be moved over, but this does the bulk of the work.

Progress towards #17191. Rewrite of !1897 (closed).

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  • are either individually buildable or squashed
  • have commit messages which describe what they do (referring to Notes and tickets using #NNNN syntax when appropriate)
  • have added source comments describing your change. For larger changes you likely should add a Note and cross-reference it from the relevant places.
  • add a testcase to the testsuite.
  • replace this message with a description motivating your change

If you have any questions don't hesitate to open your merge request and inquire in a comment. If your patch isn't quite done yet please do add prefix your MR title with WIP:.

Edited by John Ericson

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