anv: automake: ensure that the destination directory is created
Earlier commit unintentionally dropped the mkdir, as it was rebased.
Some versions of autotools will not create the output directory for
generated sources. Thus the issue went unnoticed by the original author.
Cc: Dylan Baker <dylan@pnwbakers.com>
Cc: Steven Newbury <steve@snewbury.org.uk>
Reported-by: Steven Newbury <steve@snewbury.org.uk> Fixes:
Fixes: 1610b3dede1 ("anv: don't pass xmlfile via stdin anv_entrypoints_gen.py")
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>