libio in egcs-1.0.1

[George]

In order to build libio in egcs-1.0.1 for i586-pc-linux-gnulibc2, I had to
add the following line to objdir/libraries/libio/_G_config.h:
#include <sigset.h>
above:
typedef __sigset_t _G_sigset_T;
because of a compiler complaint of an empty variable declaration.

Other than that, egcs 1.0.1 bootstrapped correctly from egcs 1.0.

Good job.

-George