25147b4aa31ea8bdc625da5838341bcd89ac796c
For some reason, the ModemManager build tends to freeze when built with QEMU user emulation for arm*. Changing the build to use a single thread only (-j1) avoids that, although the build is slower of course. The same thing seems to happen fo oFono as well, so set that to -j1 too. Also limit building to "armhf armv7 aarch64" since the forks are not needed on any other architectures, to reduce build times a bit. The other architectures can just use the upstream packages from Alpine.
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