[CMake] GenerateExportHeader

[Theodore Papadopoulo]

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	I wonder why GenerateExportHeader is tied to the C++ compiler (by
using the check_cxx_* functions instead if their check_c_* variants).
As far as I can tell it would be better to just use the C compiler (or
a function that depends on C/CXX).

On linux/mac (at least with gcc), this does not seem to be a problem,
but on windows, C only projects (Visual Studio 11) choke on the
current GenerateExportHeader because there is no C++ compiler.

	Thank's

	Theo.
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