:ADDPATCH fortran:

Hello world,

this patch allows gfortran's internal runtime_error()
function to take on printf-style arguments, in order to
report additional information to the user.  One example
is included, reporting the extents for a bounds-check error
for PR 30814.

With this patch in place, we should be able to generate more
useful diagnostics, especially for bounds-check errors.

It also removes the st_sprintf function, which used to implement
a subset of sprintf's capabilities, and replaces it with
sprintf.

Successfully bootstrapped on a recent trunk on i686-pc-linux-gnu.
Currently regression-testing.  OK for trunk if this passes?

	Thomas