🚀 go-pugleaf

The name of the eprintf facility changed in gcc 1.30 to have
an extra underscore. This is reflected in the new assert.h
that comes in the gcc distribution, and, of course, in gnulib,
where it is defined.

The bug comes from the fact that when tree.c (etc) are compiled,
the assert.h in the gcc-include directory is not seen. (At least
the last-used-time didn't get updated.) What is even more puzzling
is that a file that consists of nothing but a `#include "assert.h"'
and `main(){}' does find that new assert.h, while even moving
the include of assert.h to the top of the include list in, say,
tree.c does not produce the same effect. I was, as far as I know,
compiling with the same flags.