Patch: gcc-3.0.4 workaround for AS_SPARC64_FLAG/autoconf-2.53

[Adam J. Richter]

        autoconf-2.53 does not allow AC_DEFINE_UNQUOTED variables
that begin with "AS_", reserving that part of the name space for
autoconf m4sugar macros.  I think autoconf should allow this and
just issue a warning, but it would probably be a good idea to fix
the gcc tree to avoid this, even if it does become just a warning
in a future autoconf release.  So, the following patch to gcc-3.0.4
just globally replaces AS_SPARC64_FLAG with ASM_SPARC64_FLAG.

        gcc-3.0.4 builds fine for me with this, and I have also
verified that there does not appear to be a similar patch in gcc cvs.

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