[Nova] Remove Extraneous Build Scripts (#2695)

Summary:
There is a single pre/post script needed for building torchaudio. This PR:
1. Removes the old conda-specific build script
2. Renames the wheel script to be a general name

Pull Request resolved: https://github.com/pytorch/audio/pull/2695

Reviewed By: kit1980

Differential Revision: D39631971

Pulled By: osalpekar

fbshipit-source-id: 52b49a6e792536b6264228c01ac356d247b18ea8

packaging/post_build_script_conda.sh → packaging/post_build_script.sh

+#!/bin/bash
+set -ex
+
 echo "Running post build script..."

packaging/post_build_script_wheel.sh

-echo "Running post build script..."

packaging/pre_build_script_conda.sh

-#!/bin/bash
-set -ex
-
-echo "Running pre build script..."
-export FFMPEG_ROOT=${PWD}/third_party/ffmpeg
-if [[ ! -d ${FFMPEG_ROOT} ]]; then
-    packaging/ffmpeg/build.sh
-fi
-echo FFMPEG_ROOT=${FFMPEG_ROOT}
-
-echo "Setting environment variables for versions..."
-
-script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
-. "$script_dir/pkg_helpers.bash"
-
-export BUILD_TYPE="conda"
-export CU_VERSION="cpu"
-export PYTHON_VERSION="3.8"
-setup_env
-export SOURCE_ROOT_DIR="$PWD"
-setup_conda_pytorch_constraint
-setup_conda_cudatoolkit_constraint
-setup_visual_studio_constraint
-
-export CUDATOOLKIT_CHANNEL="nvidia"
-# NOTE: There are some dependencies that are not available for macOS on Python 3.10 without conda-forge
-# nit
-if [[ ${OSTYPE} =~ darwin* ]] && [[ ${PYTHON_VERSION} = "3.10" ]]; then
-    CONDA_CHANNEL_FLAGS="${CONDA_CHANNEL_FLAGS} -c conda-forge"
-fi