use -fno-toplevel-reorder if it's available

[Alexandre Oliva]

-fno-unit-at-a-time is no longer enough to get the gcc trunk to build
working crt files for glibc, since it no longer implies no reordering
is to occur, so we end up with #include "defs.h" at the wrong spot in
initfini.s.  -fno-toplevel-reorder is what gets the behavior we want,
so here's a patch to use it.  I've successfully built glibc for x86-64
and -32 using it.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}