(C++) sed fix for libstdc++/configure.in

[Jeffrey A Law]

  In message <199902250750.XAA09572@yorick.cygnus.com>you write:
  > Solaris sed doesn't like the old pattern.
  > 
  > 1999-02-24  Jason Merrill  <jason@yorick.cygnus.com>
  > 
  > 	* configure.in: Fix INSTALLDIR sed pattern for Solaris sed.
The odd thing is I thought we had fixed this a month or so ago.  Hmmm, maybe
the fix never got of Cygnus's releng group to the compiler folks.  

I certainly remember discussing it with releng and Ulrich.

jeff