Use std::deque (iterable) for section stack

include/asm/output.hpp

@@ -3,6 +3,7 @@
 #ifndef RGBDS_ASM_OUTPUT_H
 #define RGBDS_ASM_OUTPUT_H
 
+#include <deque>
 #include <stdint.h>
 
 #include "linkdefs.hpp"
@@ -11,7 +12,7 @@ struct Expression;
 struct FileStackNode;
 
 extern const char *objectName;
-extern struct Section *sectionList;
+extern std::deque<struct Section *> sectionList;
 
 void out_RegisterNode(struct FileStackNode *node);
 void out_ReplaceNode(struct FileStackNode *node);

include/asm/section.hpp

@@ -23,7 +23,6 @@ struct Section {
 	uint32_t bank;
 	uint8_t align; // Exactly as specified in `ALIGN[]`
 	uint16_t alignOfs;
-	struct Section *next;
 	struct Patch *patches;
 	uint8_t *data;
 };