(closes issue #13197)

(closes issue #13197)
Reported by: pj

(closes issue #13051)
Reported by: pj

This patch substitutes commas in the expr
supplied to the if () statement, as in
if ( expr ) ...

This solves both the bugs above, and makes
the source symmetric with switch statements,
which were earlier reported to need this sort
of treatment.

I tested this using the examples, both for
the compiler and at run time. Looks good.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@134652 65c4cc65-6c06-0410-ace0-fbb531ad65f3