* lib/gdb.exp (standard_output_file): Use "file join".

	* lib/gdb.exp (standard_output_file): Use "file join".
	* gdb.go/chan.exp: Use standard_testfile.
	* gdb.go/handcall.exp: Use standard_testfile.
	* gdb.go/hello.exp: Use standard_testfile.
	* gdb.integers/chan.exp: Use standard_testfile.
	* gdb.go/methods.exp: Use standard_testfile.
	* gdb.go/package.exp: Use standard_testfile.
	* gdb.go/strings.exp: Use standard_testfile.
	* gdb.go/types.exp: Use standard_testfile.
	* gdb.go/unsafe.exp: Use standard_testfile.