Add cc65 artifacts to repo for now

cc65/asminc/_heap.inc

@@ -0,0 +1,35 @@
+;
+; _heap.inc
+;
+; (c) Copyright 2003, Ullrich von Bassewitz (uz@cc65.org)
+;
+
+; Assembler include file that makes the constants and structures in _heap.h
+; available for asm code.
+
+; Struct freeblock
+; NOTE: For performance reasons, the asm code often uses increment/decrement
+; operators to access other offsets, so just changing offsets here will
+; probably not work.
+.struct freeblock
+        size    .word
+        next    .addr
+        prev    .addr
+.endstruct
+
+; Struct usedblock
+; See notes above
+.struct usedblock
+        size    .word
+        start   .addr
+.endstruct
+
+HEAP_MIN_BLOCKSIZE  = .sizeof (freeblock)   ; Minimum size of an allocated block
+HEAP_ADMIN_SPACE    = .sizeof (usedblock)   ; Additional space for used bock
+
+; Variables
+.global         ___heaporg
+.global         ___heapptr
+.global         ___heapend
+.global         ___heapfirst
+.global         ___heaplast