Don't force extension_module to build as a shared library by default

[swolchok]

Other targets seem to just use whatever the default configuration is. Make this one work the same.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Don't force extension_module to build as a shared library by default #12257

[pytorch-bot]

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❌ 1 New Failure, 1 Unrelated Failure

As of commit c4a4bba with merge base 6c74651 ():

NEW FAILURE - The following job has failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 65

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[swolchok]

hmm. the llava-runner build failure doesn't repro on Mac and I'm currently having internal-specific trouble building on my Linux machine.

[swolchok]

hmm. the llava-runner build failure doesn't repro on Mac and I'm currently having internal-specific trouble building on my Linux machine.

OK I've reproed on Linux.