Add --needed option to makepkg

Simply add the option to pass the --needed flag to pacman when using -i
with makepkg. When using makepkg in scripts, particularly for git
packages with the new version functions and not just a date, this can
save disk io and time instead of reinstalling.

This would mostly be useful with the --noconfirm option.

Signed-off-by: wgiokas <1007380@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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