Ignore APKBUILDs that have "!pmb:kconfigcheck" in their options by
default in "pmbootstrap kconfig check", but print a note that they have
been skipped. Check all kernels with "pmbootstrap kconfig check -f".
This is necessary, because the Librem 5 devboard kernel's config does
not have CONFIG_DM_CRYPT enabled in their config, and we check for
that. As the device is still under heavy development, we will make our
lives easier by just using the upstream kernel config without any
changes and ignoring it in our check by default.