testing/mangohud/APKBUILD: new aport

Merged Marian Buschsieweke requested to merge maribu/aports:testing/mangohud into master

Vulkan and OpenGL overlay for monitoring FPS, temperatures, CPU/GPU load and more https://github.com/flightlessmango/MangoHud

Note: This doesn't work for OpenGL because eh_check_addr() fails on both obj->strtab and obj->symtab in function eh_init_obj() in src/elfhacks.cpp. It does work for Vulkan already, though.

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