build.package: makedeps warning only for cross-native2

Splitting makedepends in _host and _build only makes a difference when building with cross-native2, as these packages end up in different chroots.

For QEMU only and crossdirect we install all makedepends into the foreign chroot. For cross-native (v1) we install everything into the native chroot.

Show the warning only for cross-native2 so people don't think they have to adjust their APKBUILDs here. Most of Alpine's APKBUILDs currently don't have this split either.

changed title from build.package: makedeps warning only for c-n2 to build.package: makedeps warning only for cross-native2

approved this merge request

mentioned in commit ollieparanoid/pmbootstrap@0ab75cfe

added 6 commits

• 1c791a7e...3dd7b5e1 - 5 commits from branch postmarketOS:master
• 0ab75cfe - build.package: makedeps warning only for c-n2

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