Fixed some problems found while compiling most of this with VC++2003

I could compile most of this, but not link it (SDL2's .lib files must
be too new).

src/Font.cpp

@@ -1,6 +1,5 @@
 #include "Font.h"
 
-#include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>

src/Game.cpp

@@ -1,6 +1,7 @@
 #include "Game.h"
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 
 #include <SDL_timer.h>

src/Input.cpp

@@ -2,6 +2,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 
 #include <SDL.h>
 

src/NpChar.cpp

@@ -239,9 +239,10 @@ bool SetBulletObject(int x, int y, int val)
 {
 	int tamakazu_ari[10];
 
+	int n;
 	int t = 0;
 	memset(tamakazu_ari, 0, sizeof(tamakazu_ari));
-	for (int n = 0; n < 8; n++)
+	for (n = 0; n < 8; n++)
 	{
 		int code = gArmsData[n].code;
 		if (code == 5)
@@ -255,7 +256,7 @@ bool SetBulletObject(int x, int y, int val)
 	if (!t)
 		return false;
 
-	int n = Random(1, 10 * t);
+	n = Random(1, 10 * t);
 	int bullet_no = tamakazu_ari[n % t];
 	for (n = 0x100; n < NPC_MAX; n++)
 	{

src/Organya.cpp

@@ -2,6 +2,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 
 #include <SDL_rwops.h>
 #include <SDL_thread.h>

src/Sound.cpp

@@ -1,7 +1,7 @@
 #include "Sound.h"
 
 #include <algorithm>
-#include <math.h>
+#include <cmath>
 #include <stdint.h>
 #include <string>