[build, doc] Obsolete Solaris 9 support

[Rainer Orth]

I think the time has come to obsolete Solaris 9 support:

* According to
  http://www.oracle.com/us/support/library/lsp-coverage-sun-software-309122.pdf,
  p.17, Premier Support has already ended in October 2011 and even
  Extended Support will end in October 2014, which means it's impossible
  to get patches without a special contract.  By the time GCC 4.10 is
  expected to be released (Spring 2015), this period is well past.  This
  timescale is in line with what happened for Solaris 7 (obsoleted in
  GCC 4.5) and Solaris 8 (obsoleted in GCC 4.7).

* Solaris 9 seems to be far less popular than Solaris 8 was: last time I
  checked there was only a single Solaris 9 testresults posting apart
  from my own.

* By the time Solaris 12 appears, I'll need to reduce the testing matrix
  to keep the amount of work manageable.

Therefore the following patch does just that.  Tested by
configuring/building without and with --enable-obsolete and checking
gccinstall.info on i386-pc-solaris2.9.  The config-list.mk part is
untested, but should be straightforward.

Unless there are strong objections, I plan to install this patch in a
day or two.

	Rainer


2013-05-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* config.gcc: Obsolete *-*-solaris2.9*.
	* doc/install.texi (Specific, *-*-solaris2*): Document it.

	contrib:
	* config-list.mk (LIST): Add -enable-obsolete for
	sparc-sun-solaris2.9, i686-solaris2.9.

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Rainer Orth, Center for Biotechnology, Bielefeld University