libss: add newer libreadline.so.8 to dlopen path

OpenSUSE Tumbleweed now has libreadline.so.8. Add it to the list of libs
to look for.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/lib/ss/get_readline.c b/lib/ss/get_readline.c
index 11c72b3..aa16157 100644
--- a/lib/ss/get_readline.c
+++ b/lib/ss/get_readline.c
@@ -37,7 +37,7 @@
 #endif
 
 /* Libraries we will try to use for readline/editline functionality */
-#define DEFAULT_LIBPATH "libreadline.so.7:libreadline.so.6:libreadline.so.5:libreadline.so.4:libreadline.so:libedit.so.2:libedit.so:libeditline.so.0:libeditline.so"
+#define DEFAULT_LIBPATH "libreadline.so.8:libreadline.so.7:libreadline.so.6:libreadline.so.5:libreadline.so.4:libreadline.so:libedit.so.2:libedit.so:libeditline.so.0:libeditline.so"
 
 #ifdef HAVE_DLOPEN
 void ss_get_readline(int sci_idx)