FindCUDA: Add paths for crosscompiling to aarch64

Choose a CUDA_TOOLKIT_TARGET_DIR for the aarch64 architecture
automatically.

Modules/FindCUDA.cmake

@@ -653,6 +653,9 @@ set(CUDA_VERSION_STRING "${CUDA_VERSION}")
 # Support for arm cross compilation with CUDA 5.5
 if(CUDA_VERSION VERSION_GREATER "5.0" AND CMAKE_CROSSCOMPILING AND CMAKE_SYSTEM_PROCESSOR MATCHES "arm" AND EXISTS "${CUDA_TOOLKIT_ROOT_DIR}/targets/armv7-linux-gnueabihf")
   set(CUDA_TOOLKIT_TARGET_DIR "${CUDA_TOOLKIT_ROOT_DIR}/targets/armv7-linux-gnueabihf" CACHE PATH "Toolkit target location.")
+# Support for aarch64 cross compilation with CUDA 7.0
+elseif(CUDA_VERSION VERSION_GREATER "6.5" AND CMAKE_CROSSCOMPILING AND CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64" AND EXISTS "${CUDA_TOOLKIT_ROOT_DIR}/targets/aarch64-linux")
+  set(CUDA_TOOLKIT_TARGET_DIR "${CUDA_TOOLKIT_ROOT_DIR}/targets/aarch64-linux" CACHE PATH "Toolkit target location.")
 else()
   set(CUDA_TOOLKIT_TARGET_DIR "${CUDA_TOOLKIT_ROOT_DIR}" CACHE PATH "Toolkit target location.")
 endif()