PKGBUILD: add support for arch-specific sources

This implements support for declarations such as:

  arch=('i686' 'x86_64')
  ...

  source=("somescript.sh")
  source_i686=("http://evilmonster.com/i686/ponies-9001-1.i686.bin")
  source_x86_64=("http://evilmonster.com/i686/ponies-9001-1.x86_64.bin")

  md5sums=('d41d8cd98f00b204e9800998ecf8427e')
  md5sums_i686=('e4ca381035a34b7a852184cc0dd89baa')
  md5sums_x86_64=('4019740e6998f30a3c534bac6a83f582')

Just the same as the "untagged" sources, multiple integrity algorithms
are supported. The manpage is updated to reflect support for these
suffices.

This commit also refactors download_sources slightly:

1) to use the otherwise preferred convention of lowercase local variable
names, and to make the handling of $1 more clear.
2) rename the "fast" parameter to "novcs", to make it more clear what
this token does.
3) add a new possible token "allarch" to ensure that download_sources
will fetch all sources, for all architectures.

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