Merge topic 'ExternalProject-verify-cmake-var'

420280f3 ExternalProject: Fix path to cmake in verify script

Modules/ExternalProject.cmake

@@ -709,7 +709,7 @@ does not match expected value
 Retrying download.
 \")
     file(REMOVE \"\${file}\")
-    execute_process(COMMAND ${CMAKE_COMMAND} -P \"${download_script}\")
+    execute_process(COMMAND \${CMAKE_COMMAND} -P \"${download_script}\")
   endif()
 endwhile()