Make rebuild GSM, ilbc, or lpc10 codecs if the respective sources change.

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Merged revisions 373618 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 373633 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@373635 65c4cc65-6c06-0410-ace0-fbb531ad65f3