Add "jemalloc" package

[tjxduck]

• I'm interested in package jemalloc

• Here is the official site of package http://jemalloc.net/

• Official GitHub repository: https://github.com/jemalloc/jemalloc

• Used build system: autotools

• This package has no dependencies

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[NeroBurner]

you could look if the cmake feature branch comes along nicely.

https://github.com/jemalloc/jemalloc/issues/303

[rbsheth]

Fork made: https://github.com/cpp-pm/jemalloc

@tjxduck You could merge the cmake feature branch @NeroBurner mentioned in your Hunterization.