Fixed extconf.c breakage introduced in r376306.

To quote wdoekes:
> Note that I'm not confirming legitimacy of having that file in tree at
> all. Is anyone using aelparse/conf2ael?
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Merged revisions 376340 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 376342 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 376343 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@376345 65c4cc65-6c06-0410-ace0-fbb531ad65f3