hopefully fix MSVC build

src/engine/platform/nes.cpp

@@ -23,6 +23,8 @@
 #include <cstddef>
 #include <math.h>
 
+struct _nla_table nla_table;
+
 #define CHIP_DIVIDER 16
 
 #define rWrite(a,v) if (!skipRegisterWrites) {apu_wr_reg(nes,a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }

src/engine/platform/sound/nes/apu.c

@@ -21,8 +21,6 @@
 #include <string.h>
 #include "apu.h"
 
-struct _nla_table nla_table;
-
 void apu_tick(struct NESAPU* a, BYTE *hwtick) {
 	/* sottraggo il numero di cicli eseguiti */
 	a->apu.cycles--;