[utils/build-presets] For the package preset, also install the clang headers so libclang can find them.

Author: akyrtzi

utils/build-presets.ini

@@ -588,7 +588,7 @@ mixin-preset=
 dash-dash
 
 swift-install-components=compiler;clang-builtin-headers;stdlib;sdk-overlay;sourcekit-xpc-service
-llvm-install-components=libclang
+llvm-install-components=libclang;clang-headers
 
 # Path to the .tar.gz package we would create.
 installable-package=%(installable_package)s