auto merge of #11885 : bnoordhuis/rust/issue11694, r=alexcrichton

EINVAL means that the requested stack size is either not a multiple
of the system page size or that it's smaller than PTHREAD_STACK_MIN.
Figure out what the case is, fix it up and retry.  If it still fails,
give up, like before.

Suggestions for future improvements:

  * don't fail!() but instead signal a condition, or
  * silently ignore the error and use a default sized stack.

Fixes #11694.

The first two commits put the framework in place, the third one contains the meat.

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