Configuration i386-pc-solaris2.8 not supported

[Dennis Clarke]

Minor nit with gcc-4.8-20121125.  Since the ancient old Solaris 8 is not supported 
then configure should catch that up front as opposed to having bootstrap fail. 

Here I see the first few lines output from configure : 

    checking build system type... i386-pc-solaris2.8
    checking host system type... i386-pc-solaris2.8
    checking target system type... i386-pc-solaris2.8

and then things continue normally however the bootstrap fails early and fast. 

Things like i586-pc-solaris2.8 fails also. 

I will have a look at pentiumpro-pc-solaris2.8 and then scrap Sol 8 forever if 
that fails also.  However gcc 4.7.2 built and tested wonderfully, go figure.

Dennis 

ps: I see in changelog : 

2011-07-07  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        PR target/39150
        * configure.ac (i[3456789]86-*-solaris2*): Also accept
        x86_64-*-solaris2.1[0-9]*.
        * configure: Regenerate.

so maybe *-pc-solaris2.8 will fail also .. or not