[GiNaC-devel] Patch 6

[Jan private]

Problem: MSVC creates different symbols for "extern const ex _ex0" if it
is declared at top-level (inside GiNaC namespace) and if it is declared
inside the body of a function (also inside GiNaC namespace). When
linking, unresolved external symbols occur.

Solution: Moved the declaration out of the body of the function

Note: Instead of #include utils.h the same effect would probably be
achieved by 
namespace GiNaC {
  extern const ex _ex0;
}
at the beginning of the file.
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