Change cmake/third_party files for CI (#30833)

paddle/scripts/paddle_build.sh

@@ -714,6 +714,10 @@ function generate_upstream_develop_api_spec() {
     git branch -D develop_base_pr
     ENABLE_MAKE_CLEAN="ON"
     rm -rf ${PADDLE_ROOT}/build/Makefile ${PADDLE_ROOT}/build/CMakeCache.txt
+    cmake_change=`git diff --name-only upstream/$BRANCH | grep "cmake/external" || true`
+    if [ ${cmake_change} ];then
+        rm -rf ${PADDLE_ROOT}/build/third_party
+    fi
 }
 
 function generate_api_spec() {