Rename awk(1) implementation of GNU awk's built-in asorti() function to
prevent fatal conflict should one-true-awk ever be replaced -- e.g., in
an appliance -- with GNU awk. NB: Renamed my implementation to _asorti()

MFC after:	3 days
X-MFC-to:	stable/10, stable/9


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273068 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f