map-server: cleanup: skilldb_name2id declared in header not in source-file.

src/map/skill.c

@@ -57,7 +57,7 @@
 	#error GD_SKILLRANGEMAX is greater than 999
 #endif
 
-
+DBMap* skilldb_name2id = NULL;
 static DBMap *skilldb_id2idx;			 /// Skill ID to Index lookup: skill_index = skill_get_index(skill_id)
 struct s_skill_db **skill_db;			 /// Skill DB
 static uint16 skill_num;				 /// Skill count, also as last index

src/map/skill.h

@@ -26,7 +26,7 @@ struct status_change_entry;
 #define SKILL_NAME_LENGTH 31 /// Max Skill Name length
 #define SKILL_DESC_LENGTH 31 /// Max Skill Desc length
 
-DBMap* skilldb_name2id;
+extern DBMap* skilldb_name2id;
 
 /// Constants to identify a skill's nk value (damage properties)
 /// The NK value applies only to non INF_GROUND_SKILL skills