Turn ocv_convert_to_lib_name into a function

cmake/OpenCVUtils.cmake

@@ -449,17 +449,15 @@ endmacro()
 
 
 # convert list of paths to libraries names without lib prefix
-macro(ocv_convert_to_lib_name var)
-  set(__tmp "")
+function(ocv_convert_to_lib_name var)
+  set(tmp "")
   foreach(path ${ARGN})
-    get_filename_component(__tmp_name "${path}" NAME_WE)
-    string(REGEX REPLACE "^lib" "" __tmp_name ${__tmp_name})
-    list(APPEND __tmp "${__tmp_name}")
+    get_filename_component(tmp_name "${path}" NAME_WE)
+    string(REGEX REPLACE "^lib" "" tmp_name "${tmp_name}")
+    list(APPEND tmp "${tmp_name}")
   endforeach()
-  set(${var} ${__tmp})
-  unset(__tmp)
-  unset(__tmp_name)
-endmacro()
+  set(${var} ${tmp} PARENT_SCOPE)
+endfunction()
 
 
 # add install command