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Improve copy in mkinitfs

Administrator requested to merge feature/improved_mkinitfs_copy into master

'install' does not properly handle symlinks, it copies the entire file instead of a symlink to it. This PR uses cp -a to preserve symlinks.

For example, with install, the files libc.musl-armhf.so.1 and ld-musl-armhf.so.1 are the same size, despite the fact that in rootfs libc.musl-armhf.so.1 is actually a symlink to ld-musl-armhf.so.1.

From @drebrez:

initramfs:
old size => 1 567 930
new size => 1 168 591

This might also help with #126 (closed).

This PR is from a commit in the 'add osk' branch that I made, but it's useful enough to have it here since it reduces the initramfs size by copying any symlinks over as symlinks. For osk-sdl's dependencies, this change dramatically reduces the size of initramfs-extras since binaries are not copied twice.

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