[Package] When building a toolchain, don't copy the Resource directory.

Should dramatically improve the size of the snapshost produced,
as we don't have stdlib et similia included twice. Also, it helps when
producing fat binaries, as we don't have to implement any mechanism
for sandwiching all the slices together.

Author: Davide Italiano

utils/build-presets.ini

@@ -1234,6 +1234,11 @@ verbose-build
 build-ninja
 build-swift-stdlib-unittest-extra
 
+# When producing a package, don't copy the Swift Resource/ directory.
+# This is mainly a space optimization.
+extra-cmake-options=
+   -DLLDB_FRAMEWORK_COPY_SWIFT_RESOURCES=0
+
 install-llvm
 install-swift
 install-lldb