Fix Kaldi submodule integration (#2269)

Summary:
When building Kaldi submodule, it requires to run `get_version.sh`, so that version header is available.
It was pointed that the script should run with `bash`, instead of `sh`.

Fixes https://github.com/pytorch/audio/issues/2268

Pull Request resolved: https://github.com/pytorch/audio/pull/2269

Reviewed By: carolineechen

Differential Revision: D34667726

Pulled By: mthrok

fbshipit-source-id: 761b82c54b58af2bfb2836cbe18c9708f853f1e1

third_party/kaldi/CMakeLists.txt

@@ -13,7 +13,7 @@ execute_process(
 # Update the version string
 execute_process(
   WORKING_DIRECTORY ${KALDI_REPO}/src/base
-  COMMAND sh get_version.sh
+  COMMAND bash get_version.sh
   )
 endif()