autoconf-2.53 fails on gcc-3.0.4

[Adam J. Richter]

	When I run autoconf 2.53 in gcc-3.0.4/gcc, I get

configure.in:1496: error: possibly undefined macro: AS_SPARC64_FLAG

	This is a bug in autoconf.  I think the message above should
be changed to be non-fatal, since autoconf does not know that every
identifier begining with AS_ is necessarily an autoconf/m4sugar macro.

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