fix ppc-vxworks build failure on vxlib-tls for RTPs

[Olivier Hainque <hainque at adacore dot com>]

Hello,

Building a gcc 4.5 based powerpc-wrs-vxworks cross fails while
compiling vxlib-tls.c for RTPs, with complaints about errno, EAGAIN
and the like not being visible.

The file is compiled with -mrtp and the definitions are expected to
be provided thanks to

       #ifndef __RTP__
       #include <taskHookLib.h>
       #else
 ==>   # include <errno.h>
       #endif

The problem is that __RTP__ is not defined despite -mrtp, because
rs6000/vxworks.h:TARGET_OS_CPP_BUILTINS does not invoke
VXWORKS_OS_CPP_BUILTINS as I think it should. A few common definitions
are provided there, including the one we need, and the other vxworks
ports do it already.

This is still visible on mainline, and the attached patch fixes
that. Tested by checking that the build proceeds past the failure
point after the change.

Thanks in advance,

Olivier

2010-10-19  Olivier Hainque  <hainque@adacore.com>

	* config/rs6000/vxworks.h (TARGET_OS_CPP_BUILTINS): Call
	VXWORKS_OS_CPP_BUILTINS.

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