The "%as" verb requests sscanf to allocate a buffer for us. However,
this use of 'a' has been long deprecated, and gcc doesn't support it
in this manner when using -std=c99. The modern replacement is "%ms".

Without this change, iscan couldn't read the interpreter file, in turn
breaking all scanners that require plugins.
--- backend/cfg-obj.c.orig	2020-03-19 01:27:17.254762077 +0100
+++ backend/cfg-obj.c	2020-03-19 02:01:52.293329873 +0100
@@ -1026,7 +1026,7 @@
       char *vendor = NULL;
       char *model  = NULL;
 
-      sscanf (string, "%*s %as %as", &vendor, &model);
+      sscanf (string, "%*s %ms %ms", &vendor, &model);
 
       if (list_append (_cfg->seen[CFG_KEY_SCSI], info))
         {
@@ -1108,10 +1112,10 @@
       char *library  = NULL;
       char *firmware = NULL;
 
-      sscanf (string, "%*s %*s %x %x %as %as",
+      sscanf (string, "%*s %*s %x %x %ms %ms",
               &vendor, &product, &library, &firmware);
 
       if (library && _cfg_have_interpreter (library, firmware)
           && list_append (_cfg->seen[CFG_KEY_INTERPRETER], info))
         {