Disable pythondevmode in benchmark environments

Author: rhpvorderman

tox.ini

@@ -71,20 +71,24 @@ commands=
 
 [testenv:benchmark-all]
 deps=
+setenv =
 commands=
     python ./benchmark_scripts/benchmark.py --all
 
 [testenv:benchmark-functions]
 deps=
+setenv =
 commands=
     python ./benchmark_scripts/benchmark.py --functions
 
 [testenv:benchmark-gzip]
 deps=
+setenv =
 commands=
     python ./benchmark_scripts/benchmark.py --gzip
 
 [testenv:benchmark-checksums]
 deps=
+setenv =
 commands=
     python ./benchmark_scripts/benchmark.py --checksums