Fixup readline and sim including of override.m4

[Paolo Bonzini]

On 08/21/2009 07:49 AM, Ralf Wildenhues wrote:
> Applying the fopen fixup to override.m4 and rebuilding the autotools
> update patch set made it clear that override.m4 wasn't consistently
> included everywhere in binutils+gdb yet.
>
> I used m4_include instead of m4_sinclude so that we'd learn about
> failures to include.  Unfortunately, m4 inclusion doesn't work the
> way C '#include "sub/file"' works (starting relative from the current
> file) so that a sinclude would silently fail if a configure.in file were
> added that wasn't in a direct subdir of sim (due to the then-wrong
> relative paths).
>
> OK to squash this additional change in (or just commit it before the
> patch set)?

Ok unless someone complains in 24 hours.

Paolo