epatch: Save right backups in Git multipatches
Multipatches on N Git files save wrong backups for N-1 files; only the last one has a correct backup (Bug#26084). * lisp/vc/diff-mode.el (diff-file-junk-re): Add 'Prereq: ' * lisp/vc/ediff-ptch.el (ediff-map-patch-buffer): Use 'diff-file-junk-re'. * test/lisp/vc/ediff-ptch-tests.el (ediff-ptch-test-bug25010): Rename from ibuffer-test-bug25010. (ediff-ptch-test-bug26084): New test.
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