[PD-dev] clang warning fixes

[Dan Wilcox]

Since no one is biting, I managed to fix most of the warnings by defining HAVE_ALLOCA_H and -Wno-parentheses in the Makefile.

Here’s a patch with the residuals: 

* add default: break; for unhandled case statements
* change stddef.h include to stdlib.h for alloca() on BSD as per Tobias request



> Howdy all,
> 
> I put the proposed changes in the previous patches into a couple WIP branches on GH.
> 
> https://github.com/pure-data/pure-data/pull/11 <https://github.com/pure-data/pure-data/pull/11> <https://github.com/pure-data/pure-data/pull/11 <https://github.com/pure-data/pure-data/pull/11>>
> 
> https://github.com/pure-data/pure-data/pull/12 <https://github.com/pure-data/pure-data/pull/12> <https://github.com/pure-data/pure-data/pull/12 <https://github.com/pure-data/pure-data/pull/12>>

--------
Dan Wilcox
@danomatika <https://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>
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