Clean up lib/swig/Makefile.am, Makefile.common and Makefile.swig

Confirmed that it builds and make checks on all four combintations
of --{enable,disable}-{python,guile}.

Have not tested make dist, but expect that there may be some problems
with it. I'm pretty sure that not all files that need to be removed...

go back to the generating the lists here, so make check works again

remove -/gnuradio_swig_bug_workaround.h, it's not generated anymore.

Make Guile bindings work with --with-gnuradio-core et al.

Add guile SIGINT handler to gr:wait.