When the shell evaluates 'foo | bar', it returns the status of bar, not
foo. 'foo' can fail silently: so long as 'bar' succeeds, make will
not notice and will therefore not delete the target.

So lets use 'tar cv(z|j|J)' instead of 'tar cv | (gzip|bzip2|xz)'.

Might close #4907 and #4904 (tbc)

wget uses the timestamp from the server, which is nice in theory, but
breaks makefile dependency propagation.

The automatic packages selection can be overriden.

And DxVA2 (why is that in DirectShow?!).
And Direct2D (untested - does not work in older contrib for me).