Trivial patch to make 'best_score' defined for all architectures.

Trivial patch to make 'best_score' defined for all architectures.

Fixes trivial build error on Solaris:

  acl.c: In function `get_local_address':
  acl.c:196: error: `best_score' undeclared (first use in this function)
  acl.c:196: error: (Each undeclared identifier is reported only once
  acl.c:196: error: for each function it appears in.)
  make[2]: *** [acl.o] Error 1

(issue ASTERISK-20366)
Reported by: Ben Klang
Tested by: Ben Klang
patches:
  0002-main-acl.c-Trivial.-best_score-should-be-defined-for.patch by Shaun Ruffell (license 5417)
........

Merged revisions 374632 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@374633 65c4cc65-6c06-0410-ace0-fbb531ad65f3