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Revert "if MAKE or make are in the environment, use those instead of rbconfig's"

This reverts commit afa63edfb9086c9461a5f6110158c3d55dee80dd which is a
new feature, not a bug fix.
Revert "Updated history for #443"

This reverts commit 5d69e56352c70b90fab9722114a3238afed1ba53.
Revert "! gem search now defaults to --remote and is anchored like gem list.  Fixes #166"

This reverts commit cefe716e5431dcae8011759847612a215569e93e.
make `gem search` default to remote
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