Add auto detection to Intel OCL

cmake/OpenCVDetectOpenCL.cmake

@@ -81,6 +81,7 @@ else()
     set(ENV_AMDAPPSDKROOT $ENV{AMDAPPSDKROOT})
     set(ENV_OPENCLROOT $ENV{OPENCLROOT})
     set(ENV_CUDA_PATH $ENV{CUDA_PATH})
+    set(ENV_INTELOCLSDKROOT $ENV{INTELOCLSDKROOT})
     if(ENV_AMDSTREAMSDKROOT)
       set(OPENCL_INCLUDE_SEARCH_PATH ${ENV_AMDAPPSDKROOT}/include)
       if(CMAKE_SIZEOF_VOID_P EQUAL 4)
@@ -109,6 +110,13 @@ else()
       else()
         set(OPENCL_LIB_SEARCH_PATH ${OPENCL_LIB_SEARCH_PATH} /usr/lib64)
       endif()
+    elseif(ENV_INTELOCLSDKROOT)
+      set(OPENCL_INCLUDE_SEARCH_PATH ${ENV_INTELOCLSDKROOT}/include)
+      if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+        set(OPENCL_LIB_SEARCH_PATH ${OPENCL_LIB_SEARCH_PATH} ${ENV_INTELOCLSDKROOT}/lib/x86)
+      else()
+        set(OPENCL_LIB_SEARCH_PATH ${OPENCL_LIB_SEARCH_PATH} ${ENV_INTELOCLSDKROOT}/lib/x64)
+      endif()
     endif()
 
     if(OPENCL_INCLUDE_SEARCH_PATH)