Make getenv thread-safe
#191
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In order to return a non-owning pointer without memory leaks the function needs to use a static variable. When calling it from multiple threads there is a data race during the assignment (and conversion) to this variable. Fix by making it `thread_local`. Fixes #189
MinGW seems to have a bug with function-local thread_local variables.
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In order to return a non-owning pointer without memory leaks the function needs to use a static variable.
When calling it from multiple threads there is a data race during the assignment (and conversion) to this variable.
Fix by making it
thread_local.Fixes #189