CUDA: Shared libraries on Darwin properly setup @rpath install_names

Shared libraries linked with CUDA now properly setup booth the correct
install_name but also specify headerpad_max_install_names so that the names
can be changed post build.

Modules/Platform/Darwin-NVIDIA-CUDA.cmake

@@ -0,0 +1,19 @@
+include(Platform/Darwin)
+
+set(__IMPLICT_LINKS )
+foreach(dir ${CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES})
+  string(APPEND __IMPLICT_LINKS " -L\"${dir}\"")
+endforeach()
+foreach(lib ${CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES})
+  if(${lib} MATCHES "/")
+    string(APPEND __IMPLICT_LINKS " \"${lib}\"")
+  else()
+    string(APPEND __IMPLICT_LINKS " -l${lib}")
+  endif()
+endforeach()
+
+set(CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS "-shared -Wl,-headerpad_max_install_names")
+set(CMAKE_SHARED_MODULE_CREATE_CUDA_FLAGS "-shared -Wl,-headerpad_max_install_names")
+
+set(CMAKE_CUDA_CREATE_SHARED_LIBRARY "<CMAKE_CUDA_HOST_LINK_LAUNCHER> <CMAKE_SHARED_LIBRARY_CUDA_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS> -o <TARGET> <SONAME_FLAG> <TARGET_INSTALLNAME_DIR><TARGET_SONAME> <OBJECTS> <LINK_LIBRARIES>${__IMPLICT_LINKS}")
+set(CMAKE_CUDA_CREATE_SHARED_MODULE "<CMAKE_CUDA_HOST_LINK_LAUNCHER> <CMAKE_SHARED_LIBRARY_CUDA_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>${__IMPLICT_LINKS}")