pmb.chroot.apk.install() does not build package providers

Created by: ollieparanoid

This came up while testing #1193. The mkbootimg package provides unpackbootimg now. When we run...

pmb.chroot.apk.install(args, ["unpackbootimg"])

...and there is no binary package of mkbootimg, it says that there's no APKBUILD for unpackbootimg and no binary package. Instead it should build mkbootimg and install it.

This might be fixed by pending PR #1202 already, I haven't tested it yet.

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