feat: improve llvm packaging

Signed-off-by: sisungo <[email protected]>

packages/llvm-project/wrapper/clang++.wrapper

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+LLVM_VERSION=
+ARCHITECTURE=
+
+CLANG=$(packie print package.prefix."clang (=${LLVM_VERSION}) @${ARCHITECTURE}")/bin/llvm-clang
+
+exec ${CLANG} -x c++ \
+    -isystem /lib/${ARCHITECTURE}/include \
+    -stdlib=libc++ \
+    -rtlib=compiler-rt \
+    -B /lib/${ARCHITECTURE} \
+    "$@"