move cpu specific settings for VxWorks to cpu specific config file

[Olivier Hainque]

Hello,

This fixes an inaccuracy introduced in the recent series
of patches preparing support for 64bit VxWorks configurations
together with VxWorks 7.

Alternative definitions for SIZE_TYPE, PTRDIFF_TYPE and
RTP library options were provided through a common VxWorks
configuration file, using conditional macros typically
provided in cpu specific config files, e.g. TARGET_LP64
taken from the x86 family of targets, which isn't quite
correct.

This was noticed by way of a build failure of the arm-wrs-vxworks
port, reported by Jeff (thanks !).

This change lets the arm-wrs-vxworks build get past the original
failure and I verified that the x86_64-vxworks7 port remains functional
afterwards. Committing.

The ARM build hits another failure now, which I think is unrelated to
the recent vxworks specific series of changes, but related to the large
ARM port specific cleanups currently underway.

Olivier


2017-07-04  Olivier Hainque  <hainque@adacore.com>

	* config/vxworks.h (PTRDIFF_TYPE, SIZE_TYPE): Restore
	unconditional basic definitions.
	(VXWORKS_LIBS_RTP): Likewise, prefixed by VXWORKS_SYSCALL_LIBS_RTP,
	empty by default.
	* config/i386/vxworks.h (PTRDIFF_TYPE, SIZE_TYPE): Redefine,
	accounting for 64bit ABIs using cpu specific macros available for
	this purpose.
	(VXWORKS_SYSCALL_LIBS_RTP): Likewise.

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