c_sync wrapper DLL does not export any functions

[samkristoff]

When building the C_Sync wrapper on windows using VS2010 a libfreenect_sync.dll is created by one of the build in VS projects, however no functions are exported so the DLL cannot be called from another application.

I was able to export functions by adding the following to libfreenect_sync.h:

/// If Win32, export all functions for DLL usage
#ifndef _WIN32
  #define FREENECTAPI_SYNC /**< DLLExport information for windows, set to nothing on other platforms */
#else
  /**< DLLExport information for windows, set to nothing on other platforms */
  #ifdef __cplusplus
    #define FREENECTAPI_SYNC extern "C" __declspec(dllexport)
  #else
    // this is required when building from a Win32 port of gcc without being
    // forced to compile all of the library files (.c) with g++...
    #define FREENECTAPI_SYNC __declspec(dllexport)
  #endif
#endif

and then adding "FREENECTAPI_SYNC" (without quotes) in front of each function I wanted to export in libfreenect_sync.c

I'm not sure if there is a reason this is not included by default so I'll defer to someone with more knowledge of the code.