A year on and I just had this same issue for the first time, so I thought I'd update this thread for anyone else in my shoes. I got the same slew of ipp.h errors when trying to compile the master branch with VS2017 and IPP 2021.5.3.585, but I also got it to work by choosing "Static Library" in the Project > Properties > Intel Libraries for oneAPI dialog in VS. I didn't change anything in the HISE Standalone.projucer file (or elsewhere). I opened my finished HISE project and everything worked as expected, including the convolution reverb and analyzer, so I thought I was home free, but trying to export my plugin resulted in yet another slew of IPP errors. I downloaded IPP 2020.0.166 from the archive.org link above, plopped it on my desktop, and tried exporting again. To my shock and joy, it worked immediately. I didn't update any paths anywhere so I guess it just needs to exist somewhere on your computer? Seemed too good to be true but I'll take it.
Also a heads up: If you have both installed and recompile HISE, the VS Project > Properties panel will have two categories for IPP. The 2020 one says "Intel Performance Libraries" and the 2021 one says "Intel Libraries for oneAPI." So if you changed the setting for the new version and then downgraded IPP to recompile, you'll probably need to reenable it since they're different options.