[PATCH,committed,toplevel] Sync configure.ac with gcc@165133

[Dave Korn]

    FYI:

  Committed the attached to keep top-level in sync with GCC after applying it
over there first.

ChangeLog:

	* configure.ac (build_lto_plugin): New shell variable.
	(--enable-lto): Turn on by default for all non-ELF platforms that
	have had LTO support added so far.  Set build_lto_plugin appropriately
	for both ELF and non-ELF.
	(configdirs): Add lto-plugin or not based on build_lto_plugin.
	* configure: Regenerate.

    cheers,
      DaveK
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