MFC r271879:

MFC	r271879:
awk: Use random(3) instead of rand(3)

While none of them is considered even near to cryptographic
level, random(3) is a better random generator than rand(3).

Use random(3) for awk as is done in other systems.

PR:		193147

git-svn-id: svn://svn.freebsd.org/base/stable/10@272918 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f