makepkg: Separate vcs download and extract

Previously makepkg would clone vcs sources in the download function,
regardless of the noextract settings. Now the download_* functions only
download or update the vcs sources, and the new extract_* functions just
create working copies using the specified protocols. The extract_sources
function will call the needed extract function for the protocol
specified. The tarball extraction has also been moved into its own
extract_file function to keep things consistent.

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

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