suggestion for build/ac-macros/swig.m4: initialize SWIG_PY_COMPILE to /bin/false

I casually tried to build the python bindings (in branches/1.1.x), and
was surprised when they didn't work. I had to look closely to figure
out what was going wrong: the symptom was that `make' was complaining
that there was no command named `-DLINUX=2'. Eventually I figured out
that the top-level Makefile defined SWIG_PY_COMPILE as the empty
string, because I'd overlooked a warning from configure:

        WARNING: swig versions 1.3.19, 1.3.20 or 1.3.21 are needed for swig support.

(I have 1.3.22)

So my suggestion is: initialize SWIG_PY_COMPILE, and other variables
like it, to "false" rather than letting them default to the empty
string; it might be a tiny bit easier for someone like me to notice
what's going on then.

-- 
People studying literature rarely say anything that would be of the
slightest use to those producing it.
        -- Paul Graham
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