cpplib: Revert treatment of -include

[Andreas Jaeger]

>>>>> Neil Booth writes:

 > Changing the file lookup semantics of -include to that of #include ""
 > is causing too many problems with other packages.

 > This reverts it.  In the future, I'd like to have it search the
 > #include "" path if the standard lookup fails.  At present, this
 > entails too many changes to cppfiles.c.

 > Unforunately, a consequence is that we have to remove the -g -include
 > testcase, as there is no reliable way to get the path right.
I'll tell you as soon as it fails again ;-)

Thanks,
Andreas
-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
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