How to build jemalloc for Windows

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1. Install Cygwin with at least the following packages:

* autoconf

* autogen

* gawk

* grep

* sed

2. Install Visual Studio 2015 or 2017 with Visual C++

3. Add Cygwin\bin to the PATH environment variable

4. Open "x64 Native Tools Command Prompt for VS 2017"

(note: x86/x64 doesn't matter at this point)

5. Generate header files:

sh -c "CC=cl ./autogen.sh"

6. Now the project can be opened and built in Visual Studio:

msvc\jemalloc_vc2017.sln