Q_DECL_EXPORT and Q_DECL_IMPORT undefined when exporting C code from a Qt DLL

When exporting C code within a DLL, Q_DECL_EXPORT is undefined as qglobal.h nests this within a __cplusplus conditional. But it is valid to use __declspec(dllexport) within the "extern 'C' {}" declaration. See the following references:

MSVS: http://msdn.microsoft.com/en-us/library/aa278942(v=vs.60).aspx)
GCC: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18479

Propose Q_DECL_EXPORT and Q_DECL_IMPORT definitions be moved outside the __cplusplus conditional.