Pass --disable-reloc-section on PE targets for PR 25662 test

Pass --disable-reloc-section on PE targets for PR 25662 test

Pass --disable-reloc-section on PE targets for PR 25662 test since

commit 514b4e191d5f46de8e142fe216e677a35fa9c4bb

Author: Jeremy Drake <sourceware-bugzilla@jdrake.com>
Date:   Thu Aug 27 12:58:27 2020 +0100

    Change the default characteristics of DLLs built by the linker to more secure settings.

defaulted to --enable-reloc-section.

	PR ld/26587
	* testsuite/binutils-all/objcopy.exp: Pass --disable-reloc-section
	to ld on PE targets for PR 25662 test.