bootstrap: check the new Foundation layout

Ensure that we check the new Foundation location for the paths to the
libraries.

Author: compnerd

Utilities/bootstrap

@@ -1201,7 +1201,10 @@ def main():
 
             for module in ["Foundation", "FoundationNetworking", "FoundationXML"]:
                 # Add the library.
-                symlink_force(os.path.join(args.foundation_path, 'lib' + module + '.so'), libswiftdir)
+                for path in ('Foundation', ''):
+                    if os.path.exists(os.path.join(args.foundation_path, path, 'lib{}.so'.format(module))):
+                        symlink_force(os.path.join(args.foundation_path, path, 'lib{}.so'.format(module)), libswiftdir)
+                        break
 
                 # Add Foundation's swiftmodule.
                 for extension in [".swiftmodule", ".swiftdoc"]: