Fix warning message of autogen.sh for python-binding.

[Tao Wang]

Hi,

When run autogen.sh, it complains:

src/optional/python-bindings/Makefile.am:3: variable `SWIG_SOURCES' is
defined but no program or
src/optional/python-bindings/Makefile.am:3: library has `SWIG' as
canonical name (possible typo)

Should not use SWIG_SOURCES for *.i which conflict with automake's
naming schema. I created a patch to change it to SWIG_FILES.

-- 
Regards

Tao Wang
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