linkage.exp: Do not run on remote hosts.

linkage.exp: Do not run on remote hosts.

	* gcc.misc-tests/linkage.exp: Do not run on remote hosts.
	* lib/compat.exp (compat-run): Use file_on_host, not remote_file
	build.
	(compat-execute): Likewise.
	* lib/copy-file.exp (gcc_copy_files): Use remote_download to copy
	files to remote hosts.
	* lib/c-ctorture.exp (c-torture-compile): Likewise.
	(c-torture-execute): Likewise.
	* lib/dg-pch.exp (dg-pch): Use file_on_host, not remote_file build
	or plain file.  Use remote_upload and remote_download to copy
	files about.
	* lib/scanasm.exp (dg-scan): Upload the file from the remote host
	before scanning it.

From-SVN: r123914