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Remove FLOATING_POINT from config.h.

This isn't used anywhere in the code, floating point is just the
default unless FIXED_POINT is defined.

In the speex codebase, arch.h has a check that both FIXED_POINT
and FLOATING_POINT aren't defined simultaneously, in part as a
check that the build system was constructed with thought about
these and other defines. However, we don't have such a check
and to me it seems unnecessary code.

--- a/configure.ac

+++ b/configure.ac

@@ -159,10 +159,7 @@

   ac_enable_fixed="yes";

   ac_enable_float="no";

   AC_DEFINE([FIXED_POINT], [1], [Compile as fixed-point (for machines without a fast enough FPU)])

-else

-  AC_DEFINE([FLOATING_POINT], , [Compile as floating-point (for machines with a fast enough FPU)])

-fi],

-AC_DEFINE([FLOATING_POINT], , [Compile as floating-point (for machines with a fast enough FPU)]))

+fi])

 ac_enable_fixed_debug="no"

 AC_ARG_ENABLE(fixed-point-debug, [  --enable-fixed-point-debug debug fixed-point implementation],