For the reference of anyone trying to solve the same problem, the correct answer was to ignore the vendor's supplied device driver and use the precompiled Debian rt2800usb driver instead - just apt-get install firmware-ralink; sudo modprobe rt2800usb;. Apparently Ralink's driver has needed patching to get it to compile since Ubuntu 12-ish.
Ralink Rt5370 Драйвер
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