#3148: disable JIT via env var

Merged Alessandro Ogier requested to merge branch/3148-disable-jit-via-envvar-default into branch/default

--HG-- branch : 3148-disable-jit-via-envvar-default

this PR allows to disable the JIT compiler via an environment variable PYPY_DISABLE_JIT

/cc @cfbolz

close #3148 (closed)

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