cpplib broken with long comments embedded in macros

[Jeffrey A Law]

  In message <14480.58820.749234.138255@gargle.gargle.HOWL>you write:
  > There was concern that the test case in
  > http://gcc.gnu.org/ml/gcc-bugs/1999-09/msg00796.html might not be
  > suitable for inclusion in the gcc test suite (it contained code that
  > was `merely' GPL, not copyright assigned to the FSF)
  > 
  > Here is a simpler test case that fails against egcs-20000124, and is
  > not contaminated by any other software.
Thanks.  I added your test to the testsuite.
jeff