Search bundled Clang builtin headers first
Search bundled Clang builtin headers first

to avoid finding them from the system Clang location (which may have wrong version) or from the GCC location, causing compile errors due to incompatibilities.

delta-lang/delta,delta-lang/delta,delta-lang/delta,emlai/delta,emlai/delta,emlai/delta,emlai/delta,delta-lang/delta