swig: update to 2.0.10

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
lhapdf: regenerate lhapdf_wrap.cc w/ our SWIG

Current ./pyext/lhapdf_wrap.cc is shipped w/ LHAPDF and is generated
w/ SWIG 1.3*. SWIG <= 2.0.4 versions should not be used to generate
this file. Newer version of SWIG correctly handles header includes
for newer compilers.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>