It looks like after a bump, CMake started passing `--git-dir=.git` as the first argument of `git rev-parse`.
But we do not really need to spoof `git` program now that Kaldi uses CMake’s `FetchContent` module.
We can just pass the path using configure flag directly:
https://cmake.org/cmake/help/latest/module/FetchContent.html#variable:FETCHCONTENT_SOURCE_DIR_%3CuppercaseName%3E
Git was also inadvertently used for generating `KALDI_PATCH_NUMBER`
in `VersionHelper`, to be potentially appended to `KALDI_VERSION`
but it was not actually being done by default.
We can set the variable directly to skip `VersionHelper`.
Also remove redundant `enableParallelBuild` since CMake enables it.
And drop separate `dev` output since Kaldi currently hardcodes
the `include/` directory so consumers would not be able to find them.
Splitting it out only removes 7 out of 303 MB.
34711ba5cf