16:24 tijl 

Install both 32 bit and 64 bit Linux libraries from the official Linux
driver distribution instead of the ones bundled with the FreeBSD driver
which are incomplete and 32 bit only.  This makes amd64 Linux OpenGL
programs work on FreeBSD 12.0 and recent 11-STABLE.  This does not enable
CUDA.

- Initialise DISTFILES so a file can be added by the LINUX option.
- Set EXTRACT_ONLY because the file added by the LINUX option is a
  self-extracting archive handled in post-extract.
- The patches for <355.06 and >=355.06 are identical except for the path.
  Keep only one set (listed in SUB_PATCHES) because more patches have been
  added.  Modify their path in pre-patch.  The patches have been renamed
  from extra-patch-* to extra-patch-*.in.
- Set OPTIONS_SUB and use option helpers for the LINUX option.
- Define LINUX_ARCH_SUFX like ARCH_SUFX because LINUX_ARCH can be i386 on

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