Make emerge always use shell-quote-argument
* lisp/vc/emerge.el (emerge-metachars): Obsolete. (emerge-protect-metachars): Delete. (emerge-make-diff-list, emerge-make-diff3-list): Replace all calls to `emerge-protect-metachars' with `shell-quote-argument' so that shell quoting is done the same on all system types (Bug #6136). Also shell quote `emerge-diff-program' and `emerge-diff3-program'.
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