2017-06-28:
- Rename benchmark to gsm_enc.
- Add prefix 'gsm_enc_'.
- Introduce gsm_enc_init and gsm_enc_return functions.
- Rewrite negative shifts to avoid undefined behavior.
- Fix comparisons between signed and unsigned types.
- Remove unused variables and parameters.
- Fix memory corruption in gsm_enc_Short_term_analysis_filtering.
