[patch] Refine definitions for wchar_t/wint_t on VxWorks

[Olivier Hainque]

This change refines the VxWorks macro definitions configuring
wchar_t to accommodate the VxWorks7 environment, where wchar_t
is now typically a 32bit type.

We also ensure that the definitions for wint_t are always based
on those for wchar_t, so the two remain in sync in environments
where WCHAR_TYPE is redefined for a specific CPU architecture.

The patch posted here is a minor variation on a change initially
devised by Alexandre, just moved to an even more common place where
other type related definitions are.

Tested in accordance with the description in
https://gcc.gnu.org/ml/gcc-patches/2019-12/msg00911.html

Committing to mainline.

Olivier

2019-12-13  Alexandre Oliva  <oliva@adacore.com>
            Olivier Hainque  <hainque@adacore.com>

	* config/vx-common.h (WCHAR_TYPE_SIZE): 32 on VxWorks 7.
	(WCHAR_TYPE): Pick accordingly.
	(WINT_TYPE_SIZE): Define in terms of WCHAR_TYPE_SIZE.
	(WINT_TYPE): Define in terms of WCHAR_TYPE.

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