guile: Add support for Guile 3.0.

guile: Add support for Guile 3.0.

gdb/ChangeLog
2020-06-28  Ludovic Courtès  <ludo@gnu.org>

	* guile/scm-math.c (vlscm_integer_fits_p): Use 'uintmax_t'
	and 'intmax_t' instead of 'scm_t_uintmax' and 'scm_t_intmax',
	which are deprecated in Guile 3.0.
	* configure.ac (try_guile_versions): Add "guile-3.0".
	* configure (try_guile_versions): Regenerate.
	* NEWS: Update entry.

gdb/testsuite/ChangeLog
2020-06-28  Ludovic Courtès  <ludo@gnu.org>

	* gdb.guile/source2.scm: Add #f first argument to 'format'.
	* gdb.guile/types-module.exp: Remove "ERROR:" from
	regexps since Guile 3.0 no longer prints that.

gdb/doc/ChangeLog
2020-06-28  Ludovic Courtès  <ludo@gnu.org>

	* doc/guile.texi (Guile Introduction): Mention Guile 3.0.

Change-Id: Iff116c2e40f334e4e0ca4e759a097bfd23634679