autoconf.info: Using autom4te

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Using `autom4te'

The Autoconf suite, including M4sugar, M4sh, and Autotest, in addition
to Autoconf per se, heavily rely on M4.  All these different uses
revealed common needs factored into a layer over `m4': `autom4te'(1).
   `autom4te' is a preprocessor that is like `m4'.  It supports M4
extensions designed for use in tools like Autoconf.