Added missing registerPlatforms() functions to plugins

plugins/amoeba/platforms/cuda/src/AmoebaCudaKernelFactory.cpp

@@ -33,7 +33,10 @@
 
 using namespace OpenMM;
 
-extern "C" void OPENMMCUDA_EXPORT registerKernelFactories() {
+extern "C" void registerPlatforms() {
+}
+
+extern "C" void registerKernelFactories() {
 //fprintf( stderr,"In registerKernelFactories AmoebaCudaKernelFactory\n" ); fflush( stderr );
     for( int ii = 0; ii < Platform::getNumPlatforms(); ii++ ){
         Platform& platform = Platform::getPlatform(ii);

plugins/amoeba/platforms/reference/src/AmoebaReferenceKernelFactory.cpp

@@ -33,6 +33,9 @@
 
 using namespace OpenMM;
 
+extern "C" void registerPlatforms() {
+}
+
 #if defined(WIN32)
     #include <windows.h>
     extern "C" void registerKernelFactories();

plugins/freeEnergy/platforms/cuda/src/CudaFreeEnergyKernelFactory.cpp

@@ -33,6 +33,9 @@
 
 using namespace OpenMM;
 
+extern "C" void registerPlatforms() {
+}
+
 extern "C" void registerKernelFactories() {
     // (void) fprintf( stderr, "initOpenMMCudaFreeEnergyPlugin called\n");
     if ( gpuIsAvailableSoftcore() ){

plugins/freeEnergy/platforms/reference/src/ReferenceFreeEnergyKernelFactory.cpp

@@ -36,6 +36,9 @@
 
 using namespace OpenMM;
 
+extern "C" void registerPlatforms() {
+}
+
 #if defined(WIN32)
     #include <windows.h>
     extern "C" void registerKernelFactories();