Merge pull request #2663 from aciidb0mb3r/fix-install-name

[bootstrap] Use the right install name for PackageDescription

Utilities/bootstrap

@@ -667,7 +667,8 @@ def process_runtime_libraries(build, args, lib_path):
  "-Xlinker", "-all_load",
  input_lib_path,
  "-sdk", args.sysroot,
- "-target", "x86_64-apple-macosx10.10"]
+ "-target", "x86_64-apple-macosx10.10",
+ "-Xlinker", "-install_name", "-Xlinker", "@rpath/libPackageDescription.dylib"]
  else:
  # We include an RPATH entry so that the Swift libraries can be found
  # relative to where it will be installed (in 'lib/swift/pm/<version>/...').