yvals.h on VxWorks expects the toolchain to provide its own
version of the header, which we don't do. Arrange to fallback
on the common system definitions instead.
2021-12-16 Olivier Hainque <hainque@adacore.com>
fixincludes/
* inclhack.def (vxworks_next_yvals): New hack.
* tests/base/yvals.h: New expected test result.
* fixincl.x: Regenerate.