update top-level README for the newer device_pi64 config#674

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HinTak wants to merge 5 commits intomaxnet:berryboot2018from

Commits on Dec 7, 2020

update top-level README for the newer device_pi64 config
HinTak
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Commits on Dec 8, 2020

Adding output/LICENSE.berryboot and output/overlays to .gitignore
HinTak
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Commits on Dec 9, 2020

package/libgpg-error: fix build with gawk 5.0

bkuhls
authored and
HinTak
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As downloaded, https://github.com/qt/qtbase/commit/c35a3f519007af44c3b364b9af86f6a336f6411b.patch
HinTak
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minimal sync from 64-bit config to 32-bit config
HinTak
committed