SUMMARY:
This is mostly just a cleanup patch. Support for kernels older than 2.4.19 has
been dropped in order to simplify the code.

PER-FILE CHANGES:
- ov511.c:
  - Remove support for kernels older than 2.4.19:
    - Remove old memory management code
    - Remove old V4L API support
  - Manually resubmit ISO URBs from completion handler (urb->next isn't needed
    even under 2.4 kernels)
  - Remove bogus waitqueue_active() calls. They were racy and unnecessary.
  - Eliminate remaining bits of buf_timeout code

- ov518_decomp.c:
  - Remove gratuitous typedefs

- ov6630.c:
  - More register settings cleanup

- saa7111-new.c:
  - Add proper initcall support (wouldn't compile under 2.5 without it).