fix build error of automatic CC detection

cmake/OpenCVDetectCUDA.cmake

@@ -101,7 +101,7 @@ if(CUDA_FOUND)
     else()
       set(CC_LIST ${ARGN})
       foreach(target_arch ${CC_LIST})
-        string(REPLACE "." "" target_arch_short ${target_arch})
+        string(REPLACE "." "" target_arch_short "${target_arch}")
         set(NVCC_OPTION "-gencode;arch=compute_${target_arch_short},code=sm_${target_arch_short}")
         execute_process( COMMAND "${CUDA_NVCC_EXECUTABLE}" ${NVCC_OPTION} "${OpenCV_SOURCE_DIR}/cmake/checks/OpenCVDetectCudaArch.cu"
                          WORKING_DIRECTORY "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/"
@@ -111,7 +111,7 @@ if(CUDA_FOUND)
           set(${result_list} "${${result_list}} ${target_arch}")
         endif()
       endforeach()
-      string(STRIP ${${result_list}} ${result_list})
+      string(STRIP "${${result_list}}" ${result_list})
       set(CUDA_SUPPORTED_CC ${${result_list}} CACHE INTERNAL "List of supported compute capability")
     endif()
   endmacro()
@@ -124,7 +124,7 @@ if(CUDA_FOUND)
   endmacro()
 
   macro(ocv_wipeout_deprecated _arch_bin_list)
-    string(REPLACE "2.1" "2.1(2.0)" ${_arch_bin_list} ${${_arch_bin_list}})
+    string(REPLACE "2.1" "2.1(2.0)" ${_arch_bin_list} "${${_arch_bin_list}}")
   endmacro()
 
   set(__cuda_arch_ptx "")