Improve recursion protection for VxWorks limits.h

2019-12-30  Olivier Hainque  <hainque@adacore.com>
            Jerome Lambourg  <labourg@adacore.com>

   	* config/t-vxworks: Arrange to alter/restore glimits.h
   	before/after stmp-int-hdrs, so it uses a different macro
   	name to protect itself against recursive inclusions.

Co-Authored-By: Jerome Lambourg <lambourg@adacore.com>

From-SVN: r279777