Enable libstdc++-v3 compliation on *-gnu*

[Jeff Bailey]

Per pinskia, I am sending this patch here.  I have also sent it to:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12562

*-gnu* and *-linux* are both glibc-using arch's, so they can share a config.

2003-10-09  Jeff Bailey  <jbailey@nisa.net>

        * crossconfig.m4: Share the config between *-linux* and *-gnu*

Index: crossconfig.m4
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/crossconfig.m4,v
retrieving revision 1.4
diff -u -p -r1.4 crossconfig.m4
--- crossconfig.m4      1 Oct 2003 20:45:45 -0000       1.4
+++ crossconfig.m4      9 Oct 2003 22:38:55 -0000
@@ -125,7 +125,7 @@ case "${host}" in
        ;;
     esac
     ;;
-  *-linux*)
+  *-linux* | *-gnu*)
     #os_include_dir="os/gnu-linux"
     AC_CHECK_HEADERS([nan.h ieeefp.h endian.h sys/isa_defs.h \
       machine/endian.h machine/param.h sys/machine.h sys/types.h \