[PATCH] gcc/configure.ac: fix --enable-fixed-point enablement [PR34422]

[Eric Gallager]

So, in investigating PR target/34422, I discovered that the gcc
subdirectory's configure script had an instance of AC_ARG_ENABLE with
3rd and 4th its arguments reversed: the one where it warns that the
--enable-fixed-point flag is being ignored is the one where that flag
hasn't even been passed in the first place. The attached patch puts
the warning in the correct argument to the macro in question. (I'm not
including the regeneration of gcc/configure in the patch this time
since that confused people last time.) OK to commit, with an
appropriate ChangeLog?
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