Blocked revisions 405362

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res/Makefile: alias dist-clean to distclean

A 'make distclean' is equivalent to 'make dist-clean' in the top most Makefile.
This patch updates the res/Makefile to recognize both distclean and dist-clean.
Note that this is needed for removing build.mak, which can run into problems
if the source file of Asterisk or its path is changed after build.mak is
generated.

(issue ASTERISK-22480)
Reported by: Matt Jordan

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@405363 65c4cc65-6c06-0410-ace0-fbb531ad65f3