Env variable was unused due to a missing trailing underscore
Env variable was unused due to a missing trailing underscore

It should have been MALLOC_MMAP_THRESHOLD_.

Since we haven't been using it, let's just delete it.

"The environment variables are as follows (note the trailing
       underscore at the end of the name of some variables)"
http://man7.org/linux/man-pages/man3/mallopt.3.html

"Note that there is a trailing underscore on these variable names"
https://www.ibm.com/developerworks/community/blogs/kevgrig/entry/linux_native_memory_fragmentation_and_process_size_growth?lang=en

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