In sight of upcoming update, deorbit support for legacy versions (part 1):
- Make the top comment reflect the current reality
- MASTER_SITE_SUBDIR does not have be set later, as it no longer depends on NVVERSION (this also allows to move ONLY_FOR_ARCHS where it belongs)
- Delete no longer relevant legacy only versions specific patches; retain EXTRA_PATCHES as this separation would still be needed in new versions
- All security patches only touch legacy drivers and thus also deleted
- PAE and WBINVD options are now unconditional (independent of NVVERSION)
- Drop no longer needed LIB_DEPENDS on libm.so.3 from `misc/compat5x'
- Adjust a comment and simplify regexp that had been sitting in my tree
- Stop mentioning that this driver does not support PAE-enabled kernels in pkg-message