Get rid of a stray 'extern' directive
Get rid of a stray 'extern' directive

We already indicate that rand is external at top level.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

trgill/stratisd,mulkieran/stratisd,mulkieran/stratisd,stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd,stratis-storage/stratisd