docs/cross_compiling: new page

Add the cross compiling documentation to the pmbootstrap docs.

This is based on the following wiki pages, but updated to reflect new changes with cross-native2 and to make it more readable:

• https://wiki.postmarketos.org/wiki/Pmbootstrap/Cross_Compiling
• https://wiki.postmarketos.org/wiki/Build_internals#Cross-compile_types

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• 64cc17de - docs/cross_compiling: new page (MR 2562)

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mentioned in merge request !2474 (merged)

Thanks so much for writing this. It's nice to have some definitive documentation here :D

based on chat discussion: it makes sense to keep cross-native non-deprecated, but be clear that it's only supported for building bare metal software like the kernel and u-boot.

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• 8288a827 - docs/cross_compiling: new page (MR 2562)

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resolved all threads

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• a03c0a43 - docs/cross_compiling: new page (MR 2562)

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changed the description

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• 7510e80b - docs/cross_compiling: new page (MR 2562)

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Thanks for the review! Merging this now so I can include it in the next monthly blog post. We can of course iterate on this later on in future patches.

merged