Add configure probe for rl_completion_suppress_quote.

I had supposed that all versions of Readline that have filename
quoting hooks also have the rl_completion_suppress_quote variable.
But it seems OpenBSD managed to find a version someplace that does
not, so we'll have to expend a separate configure probe for that.

(Light testing suggests that this version also lacks the bugs that
make it necessary to frob that variable.  Hooray!)

Per buildfarm.

1 files changed, 39 insertions, 0 deletions

diff --git a/configure b/configure
index a46ba40104..702adba839 100755
--- a/configure
+++ b/configure
@@ -16347,6 +16347,45 @@ if test x"$pgac_cv_var_rl_completion_append_character" = x"yes"; then
 $as_echo "#define HAVE_RL_COMPLETION_APPEND_CHARACTER 1" >>confdefs.h
 
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for rl_completion_suppress_quote" >&5
+$as_echo_n "checking for rl_completion_suppress_quote... " >&6; }
+if ${pgac_cv_var_rl_completion_suppress_quote+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdio.h>
+#if defined(HAVE_READLINE_READLINE_H)
+#include <readline/readline.h>
+#elif defined(HAVE_EDITLINE_READLINE_H)
+#include <editline/readline.h>
+#elif defined(HAVE_READLINE_H)
+#include <readline.h>
+#endif
+
+int
+main ()
+{
+rl_completion_suppress_quote = 1;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  pgac_cv_var_rl_completion_suppress_quote=yes
+else
+  pgac_cv_var_rl_completion_suppress_quote=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_var_rl_completion_suppress_quote" >&5
+$as_echo "$pgac_cv_var_rl_completion_suppress_quote" >&6; }
+if test x"$pgac_cv_var_rl_completion_suppress_quote" = x"yes"; then
+
+$as_echo "#define HAVE_RL_COMPLETION_SUPPRESS_QUOTE 1" >>confdefs.h
+
+fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for rl_filename_quote_characters" >&5
 $as_echo_n "checking for rl_filename_quote_characters... " >&6; }
 if ${pgac_cv_var_rl_filename_quote_characters+:} false; then :