plugin api conformance

plugins/xchat-plugin.h

@@ -138,16 +138,16 @@ struct _xchat_plugin
 	void (*xchat_free) (xchat_plugin *ph,
 	    void *ptr);
 	int (*xchat_set_pluginpref_str) (xchat_plugin *ph,
-		char *var,
-		char *value);
+		const char *var,
+		const char *value);
 	int (*xchat_get_pluginpref_str) (xchat_plugin *ph,
-		char *var,
+		const char *var,
 		char *dest);
 	int (*xchat_set_pluginpref_int) (xchat_plugin *ph,
-		char *var,
+		const char *var,
 		int value);
 	int (*xchat_get_pluginpref_int) (xchat_plugin *ph,
-		char *var);
+		const char *var);
 };
 #endif
 
@@ -305,21 +305,21 @@ xchat_free (xchat_plugin *ph,
 
 int
 xchat_set_pluginpref_str (xchat_plugin *ph,
-		char *var,
-		char *value);
+		const char *var,
+		const char *value);
 
 int
 xchat_get_pluginpref_str (xchat_plugin *ph,
-		char *var,
+		const char *var,
 		char *dest);
 
 int
 xchat_set_pluginpref_int (xchat_plugin *ph,
-		char *var,
+		const char *var,
 		int value);
 int
 xchat_get_pluginpref_int (xchat_plugin *ph,
-		char *var);
+		const char *var);
 
 #if !defined(PLUGIN_C) && defined(WIN32)
 #ifndef XCHAT_PLUGIN_HANDLE