whisper : remove empty .gitmodules file [no ci] (#3085)

This commit removes the empty `.gitmodules` file from the repository.

The motivation of this is that this file is currently empty and the
project does not use any submodules at this time. Removing it mainly to
reduce clutter in the repository and any confusion when seen the file
in repo.

diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644 (file)
index e69de29..0000000