feat(libc): import qsort implementation

Import qsort implementation from FreeBSD[1] to libc.

[1]: https://cgit.freebsd.org/src/tree/lib/libc/stdlib/qsort.c

Change-Id: Ia0d8e2d1c40c679844c0746db1b669cda672a482
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
4 files changed