fix cmake typo elsef

Author: wenju-he

cmake/modules/CMakeFunctions.cmake

@@ -141,7 +141,7 @@ function(apply_patches repo_dir patches_dir base_revision target_branch)
                 message(STATUS "[OPENCL-CLANG] Not present - ${patching_log}")
             endif()
         endforeach(patch)
-    elsef(patches_needed EQUAL 0) # The target branch already exists
+    elseif(patches_needed EQUAL 0) # The target branch already exists
         execute_process( # Check it out
             COMMAND ${GIT_EXECUTABLE} checkout ${target_branch}
             WORKING_DIRECTORY ${repo_dir}