PKGBUILD: handle arch specific attributes

This introduces support for architecture-specific conflicts, depends,
optdepends, makedepends, replaces, and conflicts by appending "_$CARCH"
to the array name. For example, in the global section:

  arch=('i686' 'x86_64')
  depends=('foo')
  depends_x86_64=('bar')

This will generate depends of 'foo' and 'bar' on x86_64, but only 'foo'
on i686. Moreover, this is supported in the package functions with the
same heuristics as the generic names, e.g.

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

  package_somepkg() {
    depends_x86_64=('bar')

    ...
  }

Again, will cause x86_64 to have depends of 'foo' and 'bar', but only
'foo' for i686.

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