[Patch-gnuradio] simplify module renaming in howto-write-a-block

[Don Ward]

I'm still struggling with fitting my old custom code into the new howto 
template, but I think I've found a small change that would make it a little 
easier:  By using $(modname) in place of "howto" in Makefile.swig.gen I 
think we can rename entire modules just by changing the name in Makefile.am. 
This should also be mentioned in README.hacking (I am willing to do an 
editing pass on that after I have learned enough to be dangerous!)

-- Don W.

Makefile.swig.gen.diff
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