[PATCH] fix PR ada/80888

[Simon Wright]

The GNAT reference manual says in 11.6 Wide_Text_IO
<https://gcc.gnu.org/onlinedocs/gnat_rm/Wide_005fText_005fIO.html>,

  "The default encoding method for the standard files, and for opened
  files for which no WCEM parameter is given in the FORM string matches
  the wide character encoding specified for the main program (the
  default being brackets encoding if no coding method was specified with
  -gnatW)."

This is not true; the default is brackets encoding regardless of the
coding method specified with -gnatW.

The attached patch (to 7.1.0) corrects this. Tested on
x86_84-apple-darwin15 by rebuilding the library (cd gcc; make gnatlib
gnatlib-shared) and make -j4 check-ada,

		=== acats Summary ===
# of expected passes		2320
# of unexpected failures	0
/Volumes/Miscellaneous/tmp/gcc-7.1.0/gcc/testsuite/ada/acats/run_all.sh completed at Fri 26 May 2017 15:44:52 BST

		=== gnat Summary ===

# of expected passes		2569
# of expected failures		24
# of unsupported tests		7
/Volumes/Miscellaneous/tmp/gcc-7.1.0-build/gcc/gnatmake version 7.1.0

gcc/ada/Changelog:

	2017-05-27 Simon Wright <simon@pushface.org>

	PR ada/80888
	* a-textio.adb (Set_WCEM): default the file's wide character encoding
	  method to Default_WCEM, not WCEM_Brackets.
	* a-witeio.adb: likewise.
	* a-ztexio.adb: likewise.

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