[spec] Ensure the correct clang is used.
[spec] Ensure the correct clang is used.

ashfurrow/cocoapods-keys,kazuph/cocoapods-keys,ashfurrow/cocoapods-keys,colinta/cocoapods-keys,anurlybayev/cocoapods-keys,kazuph/cocoapods-keys,AutoScout24/cocoapods-keys,anurlybayev/cocoapods-keys,orta/cocoapods-keys,colinta/cocoapods-keys,AutoScout24/cocoapods-keys,orta/cocoapods-keys