[Feature] add GA346 baseline version

Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/meta/meta-mediatek/dynamic-layers/meta-clang/recipes-devtools/clang/llvm-project-source.bbappend b/meta/meta-mediatek/dynamic-layers/meta-clang/recipes-devtools/clang/llvm-project-source.bbappend
new file mode 100644
index 0000000..5bf7379
--- /dev/null
+++ b/meta/meta-mediatek/dynamic-layers/meta-clang/recipes-devtools/clang/llvm-project-source.bbappend
@@ -0,0 +1,6 @@
+FILESEXTRAPATHS_append := ":${THISDIR}/files"
+
+SRC_URI_append = " \
+                  file://0002-use-gcc_s-instead-unwind.patch \
+"
+