ggml-cpu : prevent kleidiai build/install targets

* currently cmake install targets of kleidiai generate error
* use `FetchContent_Populate` to disable all build/install targets of kleidiai
* note that cmake would complains about the deprecation of `FetchContent_Populate`

Signed-off-by: Yongjoo Ahn <yongjoo1.ahn@samsung.com>

Author: anyj0527

ggml/src/ggml-cpu/CMakeLists.txt

@@ -560,7 +560,7 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
             DOWNLOAD_EXTRACT_TIMESTAMP NEW
             URL_HASH MD5=${KLEIDIAI_ARCHIVE_MD5})
 
-        FetchContent_MakeAvailable(KleidiAI_Download)
+        FetchContent_Populate(KleidiAI_Download)
         FetchContent_GetProperties(KleidiAI_Download
             SOURCE_DIR  KLEIDIAI_SRC
             POPULATED   KLEIDIAI_POPULATED)
@@ -571,11 +571,6 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
 
         add_compile_definitions(GGML_USE_CPU_KLEIDIAI)
 
-        # Remove kleidiai target after fetching it
-        if (TARGET kleidiai)
-            set_target_properties(kleidiai PROPERTIES EXCLUDE_FROM_ALL TRUE)
-        endif()
-
         list(APPEND GGML_CPU_SOURCES
             ggml-cpu/kleidiai/kleidiai.cpp
             ggml-cpu/kleidiai/kernels.cpp