GNU libgomp: OMP_DISPLAY_ENV

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### 3.2 `OMP_DISPLAY_ENV` – Show OpenMP version and environment variables

Description:

  If set to `TRUE`, the OpenMP version number and the values associated with the OpenMP environment variables are printed to `stderr`. If set to `VERBOSE`, it additionally shows the value of the environment variables which are GNU extensions. If undefined or set to `FALSE`, this information will not be shown.

Reference:

  OpenMP specification v4.0, Section 4.12