Revert "libc: Implement bsort(3) a bitonic type of sorting algorithm."

Revert "libc: Implement bsort(3) a bitonic type of sorting algorithm."

Some points for the future:
 - libc is not the right place for sorting algorithms.
   Probably libutil is better suited for this purpose or
   a dedicated libsort. Should move all sorting algorithms
   away from libc eventually.
 - CheriBSD uses capabilities for memory access, and could
   benefit from a standard memswap() function.
 - Do something about qsort() in FreeBSD's libc like:
   - Mark it deprecated on FreeBSD, as a first step,
     due to missing limits on CPU time.
   - Audit the use of qsort() in the FreeBSD base system
     and consider swapping to other existing sorting
     algorithms.

Discussed with:	brooks@

Differential Revision:	https://reviews.freebsd.org/D36493

This reverts commit a7469c9c0a504a5e6e9b89e148cd78df5e67ff7f.
This reverts commit 7d65a450cdcc7cc743f2ecd114ba3428a21c0033.
This reverts commit 8dcf3a82c54cb216df3213a013047907636a01da.