message: removing references to unused env vars from the rocm_configure.bzl file
diff: * `TF_NEED_ROCM`: Whether to enable building with ROCm.
  * `GCC_HOST_COMPILER_PATH`: The GCC host compiler path
  - * `ROCM_TOOLKIT_PATH`: The path to the ROCm toolkit. Default is
  - `/opt/rocm`.
  - * `TF_ROCM_VERSION`: The version of the ROCm toolkit. If this is blank, then
  - use the system default.
  - * `TF_MIOPEN_VERSION`: The version of the MIOpen library.
  + * `ROCM_PATH`: The path to the ROCm toolkit. Default is `/opt/rocm`.
  * `TF_ROCM_AMDGPU_TARGETS`: The AMDGPU targets.
  """
  @@ -36,13 +32,9 @@ load(
  _GCC_HOST_COMPILER_PATH = "GCC_HOST_COMPILER_PATH"
  _GCC_HOST_COMPILER_PREFIX = "GCC_HOST_COMPILER_PREFIX"
  _ROCM_TOOLKIT_PATH = "ROCM_PATH"
  -_TF_ROCM_VERSION = "TF_ROCM_VERSION"
  -_TF_MIOPEN_VERSION = "TF_MIOPEN_VERSION"
  _TF_ROCM_AMDGPU_TARGETS = "TF_ROCM_AMDGPU_TARGETS"
  _TF_ROCM_CONFIG_REPO = "TF_ROCM_CONFIG_REPO"
  -_DEFAULT_ROCM_VERSION = ""
  -_DEFAULT_MIOPEN_VERSION = ""
  _DEFAULT_ROCM_TOOLKIT_PATH = "/opt/rocm"
  def verify_build_defines(params):
  @@ -828,8 +820,6 @@ _ENVIRONS = [
  _GCC_HOST_COMPILER_PREFIX,
  "TF_NEED_ROCM",
  _ROCM_TOOLKIT_PATH,
  - _TF_ROCM_VERSION,
  - _TF_MIOPEN_VERSION,
  _TF_ROCM_AMDGPU_TARGETS,
  ]
  