static compilation problem under Windows 32 bits

Issue created by migration from Trac.

Original creator: @ycollet

Original creation time: 2017-05-09 11:57:58

Assignee: somebody

Version:

When I try to compile CoinMP on Windows in 32 bits, I am not able to link my example with the library. The linker complains about missing sympbols.
I tracked down the problem. It comes from CoinMP.h:
```
#if defined(_MSC_VER) && !defined(HAVE_CONFIG_H)

# define SOLVCALL __stdcall
# if defined(SOLVER_EXPORT) && !defined(_WIN64)
# define SOLVAPI __declspec(dllexport)
# endif
# if defined(SOLVER_IMPORT)
# define SOLVAPI __declspec(dllimport)
# endif
```

If I remove "# define SOLVCALL __stdcall" and " && !defined(_WIN64)" everything is working fine.

Start by inspecting CoinMP.h, especially the SOLVCALL and SOLVAPI definitions used for 32-bit Windows builds. Reproduce the reported linker failure with the Windows 32-bit example, then verify that the library links successfully while the appropriate symbol export and calling-convention behavior remains intact.

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