addition of OPENMMCUDA_EXPORT for Windows compile

platforms/cuda/src/kernels/bbsort.cu

@@ -305,7 +305,7 @@ Also note that you need to use 1.3 capbility (use arch=sm_13 in your compile com
 *************************************************************************************/
 
 template<>
-void bbSort(int2* dData,int size,int listOrder)
+void OPENMMCUDA_EXPORT bbSort(int2* dData,int size,int listOrder)
 {
 
 	bbSortBody(dData,size,listOrder);

platforms/cuda/src/kernels/gpu.cpp

@@ -1735,7 +1735,7 @@ void gpuInitializeRandoms(gpuContext gpu)
 }
 
 extern "C"
-bool gpuIsAvailable()
+bool OPENMMCUDA_EXPORT gpuIsAvailable()
 {
     int deviceCount;
     cudaGetDeviceCount(&deviceCount);

platforms/cuda/src/kernels/gputypes.h

@@ -190,7 +190,7 @@ typedef struct _gpuContext *gpuContext;
 
 // Function prototypes
 extern "C"
-bool gpuIsAvailable();
+bool OPENMMCUDA_EXPORT gpuIsAvailable();
 
 extern "C"
 void gpuSetBondParameters(gpuContext gpu, const std::vector<int>& atom1, const std::vector<int>& atom2, const std::vector<float>& length, const std::vector<float>& k);

platforms/opencl/include/OpenCLPlatform.h

@@ -63,7 +63,7 @@ public:
     }
 };
 
-class OpenCLPlatform::PlatformData {
+class OPENMM_EXPORT OpenCLPlatform::PlatformData {
 public:
     PlatformData(int numParticles, const std::string& deviceIndexProperty);
     ~PlatformData();