upgrade libplacebo to libplacebo-v7.349.0-260325153025 for macos by cd

Author: Anka

configs/libs/libplacebo.sh

@@ -31,3 +31,4 @@ if [[ "$GIT_LIBPLACEB0_UPSTREAM" != "" ]] ;then
 else
     export GIT_UPSTREAM=https://github.com/haasn/libplacebo.git
 fi
+export PRE_COMPILE_TAG_MACOS=libplacebo-v7.349.0-260325153025