maint: Prohibit "devname" by a syntax check rules

and tweak the code to avoid using it.

include/libvirt/libvirt.h.in

@@ -5601,7 +5601,7 @@ typedef enum {
 } virDomainConsoleFlags;
 
 int virDomainOpenConsole(virDomainPtr dom,
-                         const char *devname,
+                         const char *dev_name,
                          virStreamPtr st,
                          unsigned int flags);